FCC ID: BEJ-WL2SB21 Wireless Audio Module

User Manual Product Name: Wireless Audio Module Model: WL2SB21 Brand: LG Part No.: SWA52-L1 LG Electronics Inc. 222, LG-ro Jinwi-myeon Pyeongtaek-si, Gyeonggi-do, 17709, Republic of Korea 1 WL2SB21 Module Rev 1.0 Table of Contents General Description .......................................................................................................................................... 2 1 2 Product Photograph .................................................................................................................................. 3 Standard Compliance ............................................................................................................................... 4 3 WL2SB21 Functional Block Diagram andFunctionalDescription ......................................................... 5 4 WL2SB21 Connector Imformation ........................................................................................................... 9 5 WL2SB21Mechanical Information.......................................................................................................... 10 6 Electrical, Audio and Timing Specifications ........................................................................................ 12 7 Antenna specification ............................................................................................................................. 18 8 Ordering Information............................................................................................................................... 19 2 WL2SB21 Module Rev 1.0 General Description Extended Range Mono/Stereo Wireless Audio System, based on the Skyworks AV5100 GeneralDescription The WL2SB21 module is a member of a family of products representing a new level of system integration offering customers fast time to market with a point-to-point mono, or stereo, wireless connection. These modules are optimized for low-cost, high-quality and ease-

of-use. incorporates The module Skyworkss proprietary 5GHz wireless audio protocol, designed from the ground up specifically for latency, audio. uncompressed CD quality mono or stereo audio, superior interference immunity, and inherent coexistence with WiFi. features fixed low It Extended range is enabled on WL2SB21 with an external RF power amplifier

(PA), increasing typical transmit power to as much as 12dBm typical. The WL2SB21 module integrates all features necessary to complete a wireless stereo or mono link, including AV5100 Wireless Audio Chip, printed diversity antennas, PA, shield can, flash memory, interface connector and all passive components. Just provide power and an I2S interface and you are ready to create a wireless audio link. The module measures 35 x 35 x 2.7 mm and is provided with a 26 pin FPCconnector. The module is certified to FCC and CE standards(TBD). Applications Wireless Subwoofers Stereo Wireless RearSpeakers Soundbar / Audio Video Receiver /BluRay Mono/Stereo Audio ChannelTransmission OrderingOptions WL2SB21 TX: Transmit module with digital audio input WL2SB21 RX: Receive module with digitalaudio output Features AudioInterfaces I2S Digital Input / Output interfacewith

>93dB end-to-end digital audio path Wireless Range(Typ)

> 50m Non Line Of Sight (NLOS)range

> 160m Line Of Sight (LOS) range Frequency range: 5.725-5.875 GHz, continuous dynamic channelselection Forward error correction coding,error detection, and audio-specific error concealment Dual printed PCB diversity antennas for multipath and fadingmitigation Auto-search/synch and dynamicchannel selection Low, fixedlatency 26 pin FPC or pin headerconnector Sample rate converter: Support for 32-

96kHz input samplerates Customizable firmware for simple, low-cost, sub-woofer amplifierimplementations RF parts can-shielded, module meets FCC part 15 rules for emissions andsusceptibility. General purpose over-the-air (OTA)serial interface:

11 kbps, bi-directional, fullduplex Support for amplifier control data, meta-

data, and remote controlcommands 3 WL2SB21 Module Rev 1.0 1 Product Photograph WistronNeweb Corp. REG.DATE: 2022.03.15 SPECIFICATION REV.NO :1.0 REV.DATE: 2022.03.15 MODEL NAME : 48SWA598.SGB Product Photograph_Top View Product Photograph_Bottom View 4 WL2SB21 Module Rev 1.0 2 Standard Compliance No Pass Certificaton(TBD) Certification number 1 2 3 4 5 6 7

(FCC) IC CE UKCA KCC ANATEL RAMATEL BEJ-WL2SB21 2703H-WL2SB21 5 WL2SB21 Module Rev 1.0 3 WL2SB21 Functional Block Diagram and Functional Description FCC frequency range: 5155.35-5247.35 & 5726.35-5848.35 & 5850.35-5874.35MHz IC frequency range: 5155.35-5247.35 & 5726.35-5848.35MHz EU / UKCA frequency range: 5728.35-5872.35MHz Figure 1: WL2SB21 Module Block Diagram The WL2SB21 module is available in 2 variations; digital input transmitter module or digital output receiver module. There are three available I2S digital audio data inputs/outputs, each of these can be configured to operate as either a master or a slave - depending on the application, the I2S ports can operate simultaneously as either inputs or outputs. When configured as slaves, the I2S inputs/outputs can be independently clocked by up to two external masters. In addition, MCLK can be output from the module to provide a reference clock source to an external ADC or DAC. MCLK can also be input to the module to provide a reference clock from an externalsource. Figure 1 shows the block diagram of the WL2SB21 module. The hardware for the audio input (transmit) and audio output (receive) versions of the module is identical and only the firmware loaded onto the module determines its function. The highly integrated nature of the AV5100 transceiver IC results in few external components being required for the WL2SB21 module design. 2 printed PCB antennas are used to achieve increased range, and to achieve antenna spatial diversity. The extended-range RF path consists of the antennas, associated tuning components, shield can, the RF switch, RF power amplifer (PA) and two baluns, one connected to each of the RF input/output ports on the AV5100 IC. A 16MHz crystal oscillator generates the AV5100 fundamental system clock used as the basis for all RF and digital audio clocks. The AV5100 is able to boot from internal ROM upon first power up, which enables programming the flash chip with the application firmware through USB. In addition, Over-the-air Firmware upgrade capability can be enabled through the application firmware. The module can be controlled from an external host device via the I2C Slave or the SPI Slave data interfaces. The I2C master port allows the module to control other system audio devices such as a sub- woofer amplifier system without having to add another MCU to the product design. Up to 9 additional GPIOs are available on the WL2SB21 module (not including I2C and I2S signals) for implementing different UI features on the target application. The resources mentioned above can be leveraged to implement low cost sub- woofer designs as outlined below. The firmware of the module has locked the set of the parameter, its not allowed to adjust the parameter in any way. Its the same as the usual wireless mechanism, the transmission will be stopped automatically if the transmission information is missed/ lacked or failed. 6 WL2SB21 Module Rev 1.0 3.1 Typical Sub-Woofer Implementation A basic AV5100 Wireless Subwoofer system block Diagram is shown in Fig. 2. Figure 2: AV5100 Wireless Subwoofer Solution Block Diagram A simple low cost implementation of sub-woofer design is shown in Figure 3. The sub amplifier consists of a PWM chip plus an output stage device, but no external MCU is required as the WL2SB21 RX module performs the control function using the I2C master communication port in conjunction with multiple GPIOs. The WL2SB21 module is configured to accept nominal 3.3V power from the main application board. An optional reset signal can be supplied to the WL2SB21 RX module and I2C or SPI slave communication can be used to control the module if required. Several GPIOs can be used to drive LEDs, or to connect to UI buttons. Typically 2 LEDs may be used and 1 button for pairing purposes. Another button could be used, for example, to implement a bass enhance feature. Another GPIO can be used to control the power supply to external system blocks such as the PWM IC and the output stage. The WL2SB21 RX module can remain powered up during a standby or low power operating mode; however, a true power-down mode can be implemented by configuring pin 17

(GPIO15/ADAT2/CEN) to be used as a chip-enable pin that can be used to power down the AV5100. The WL2SB21 can also be completely powered down by turning off the main 3.3Vsupply. If the wireless link is lost (ex. when the sound bar is powered down), the WL2SB21 RX module can, after a timeout period, power down the amplifier and output stage sections to conserve power and to help meet Energy Star requirements. The I2C master port from the WL2SB21 RX module (pins 5 and 6 on the connector) can communicate, control, and initialize external audio ICs such as the PWM chip in this example. Other GPIOs can be used to detect fault conditions (over temperature etc) and notify the module. The audio is routed from the WL2SB21 RX module to the amplifier circuit with the I2S output port which can be configured as either a master or a slave as required. MCLK can also be generated from the WL2SB21 RX module as a 12.00 MHz clock ifrequired. Figure 3: WL2SB21 Module Simple Sub-Woofer Implementation 7 WL2SB21 Module Rev 1.0 3.2 WL2SB21 Module Connections and Interfaces Signal Type Description

+3.3V Supply The WL2SB21 hardware is configured to accept a nominal +3.3V supply. Reset I2S In Port I2S Out Port I2C Slave Port I2C Master Port GPIOs Active low reset input. This pin is driven from an open collector/drain device such that it can be pulled to ground for the active reset state but, when released, must go to a high impedance state. This pin should not be actively driven high, as the AV5100 internal reset circuit will not operate correctly. The I2S input port can be configured as a master or slave. Consequently BCLK and LRCK can be either inputs or outputs. In addition, MCLK can be sourced by the module on pin 16. Since the AV5100 IC contains a sample rate converter, MCLK is not required to be supplied to the module when it is an I2S slave. CMOS 3.3V logic levels are used for all I2Ssignals. The I2S output port can be configured as a master or slave. Consequently BCLK and LRCK can be either inputs or outputs. In addition, MCLK can be sourced by the module on pin 16. Since the AV5100 IC contains a sample rate converter, MCLK is not required to be supplied to the module when it is an I2S slave. CMOS 3.3V logic levels are used for all I2Ssignals. The I2C slave port can be used for external host communication and for module testing. It is assumed that external pull up resistors are connected at the I2C master communicating with the module. The I2C master port is used to communicate with external audio devices such as a sub-woofer amplifier. It is assumed that external pull up resistors are included on the application board. 3.3V CMOS logic level GPIOs available to connect to other devices, or to use as UI supporting GPIOs for LED and button support. All supported GPIOs can be configured as outputs or inputs with configurable pull-ups/pull-downs. 8 1 2 3 4 5 6 7 8 9 WL2SB21 Module Rev 1.0 4 WL2SB21 Connector Information Table 1: WL2SB21 Connector Information No Pin Name Pin Type AV5100 Pin WL2SB21 TX Pin VDD GND GND Supply Input 31 Description

+3.3V input supply voltage GND GND Paddle (57) GND Paddle (57) GND WL2SB21 RX Pin Description

+3.3V input supply voltage GND GND GPIO20/ Green_LED Digital I/O 56 GPIO22/ Red_LED Digital I/O GPIO10/MCLK Digital I/O GPIO13/DATA_B Digital I/O GPIO13/DATA_A Digital I/O 43 53 50 49 GPIO, or LINK_LEDOutput GPIO, or LINK_LED Output GPIO, or LINK_LEDOutput

(default is NC pin for TX module) GPIO or I2S Port 1 Audio Data DIN_Rear_L GPIO, or LINK_LED Output

(default is output of MCLK for RX module) GPIO or I2S Port 1 Audio Data DOUT_Woofer or Rear GND GND Paddle (57) GND GND 10 GPIO4/S_SCL/M_SCL Digital I/O 9 11 GPIO5/S_SDA/M_SDA Digital I/O 10 12 GPIO9/M_MISO Digital I/O 13 GPIO8/M_MOSI Digital I/O 14 GPIO7/M_SCLK Digital I/O 15 GPIO6/S_SSB Digital I/O 5 6 7 8 16 GPIO25/SPI_WP Digital I/O 40 17 RESETN_EXT Digital Input 37 18 19 20 21 22 23 GPIO15/PWR_SENSE Digital I/O GPIO24/PWR_CTRL Digital I/O GPIO23/PWM_RESET Digital I/O GPIO18_RESET Digital I/O GPIO19_AMP_SD/OTW Digital I/O GPIO21_PAIR Digital I/O 48 41 42 2 1 55 24 GPIO11/BCLK Digital I/O 52 GPIO, I2C Master Serial Clock GPIO, I2C Master Serial Data GPIO, SPI Slave Data In GPIO, SPI Slave Data In GPIO or SPI Slave Serial Clock GPIO or SPI Slave Chip Select GPIO or SPI Slave Chip Select GPIO, I2C Master Serial Clock GPIO, I2C Master Serial Data GPIO, SPI Master Data In GPIO, SPI Master Data In GPIO or SPI Slave Serial Clock GPIO or SPI Slave Chip Select GPIO or SPI Slave Chip Select RESET signal active low (4) Reserved RESET signal active low

(4) PWR_SENSE Reserved Reserved Reserved Reserved PWR_CTRL PWM_RESET AMP_RESET AMP_SD/OTW GPIO, or input from PAIR Button GPIO, or input from PAIR Button GPIO or I2S Port 1 Bit Clock GPIO or I2S Port 1 Bit Clock 25 26 GND GND Paddle (57) GND GND GPIO12/LRCK Digital I/O 51 GPIO or I2S Port 1 Word Clock GPIO or I2S Port 1 Word Clock 9 WL2SB21 Module Rev 1.0 5 WL2SB21 Mechanical Information The mechanical design of the WL2SB21 is shown in Figure 4. The location of the 26 pin connector, locating slots, and mounting hole are dimensioned. The module features a shield can which height is 1.9mm above PCB. The top 27.8x 6mm area is consumed by the 2 PCB antennas. It is critical in product designs for the antenna part of the module to be located away from all metal objects and ideally away from close proximity to plastic. Figure 4 WL2SB21 Module Outline and Mechanical Dimensions

- PCBthicknessis0.8mm

- Thetopofshieldis1.9mmabovePCB

- ThemaximumheightfromthebottomofthePCBtothetopoftheshieldcanis2.7mm. PCBthickness +/- 0.08mm tolerance is related to PCB production process variation. CONTENTS SUBJECT TO CHANGEWITHOUTNOTICE 10 CONFIDENTIAL WL2SB21 Module Rev 1.0 6 6.1 Electrical, Audio and Timing Specifications Absolute Maximum Ratings Absolute Maximum Ratings (AMR) are stress ratings only. AMR corresponds to the maximum value that can be applied without leading to instantaneous or very short-term unrecoverable hard failure (destructive breakdown). Stresses beyond those listed under AMR may cause permanent damage to the device. Functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Range is not implied. Exposure to absolute-maximum-rated conditions for extended periods may adversely affect device reliability. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. CONDITION

+3.3V Supply Voltage Input Input Voltage Range Digital Inputs Input Voltage Range Analog Inputs Operating Temperature Storage Temperature Static Discharge Voltage1 MIN 3.0

-0.3V

-0.3V

-40C

-40C 2kV Notes:

1) HBM = ESD Human Body Model; C = 100pF, R = 1k MAX 3.6V 3.6V 3.6V

+60C

+70C

6.2 Recommended Operating Range PARAMETER VDD, +3.3V Supply pin voltage Ambient Temperature (TA) RESET pin hold time Power Supply Rise Time (to 3.0V) MIN 3.0 0 10 0 TYP 3.3 MAX UNIT 3.6 55 10 V C msec msec 11 WL2SB21 Module Rev 1.0 6.3 Electrical Characteristics DC Characteristics Operating Conditions: VDD = 3.0 to 3.6V, TA = 0C to +55 C, RF Freq = 57255875MHz, measured relative to the RF balun singleended I/O. Typical specifications at TA = 25C, VDD = 3.3V PARAMETER CONDITIONS MIN TYP MAX UNIT Supply Current (IVDDA) Shutdown (chip disabled) Standby (also USB suspend) RX mode (continuous RX) TX mode (continuous TX); Pout=+12dBm 89 330 CMOS I/O Logic Levels 3.3V I/O Input Voltage Logic Low, VIL Input Voltage Logic High, VIH Output Voltage Logic Low, VOL Output Voltage Logic High, VOH VDDIO0.6 VDDIO0.3 1 uA 2.5 mA mA mA V V V V 0.6 0.3

*a : This is DCRMS current consumption value. If customer want to implement OCP(over current protection) for SWA52-L1, please consult with WNC for proper setting and design. 6.4 Electrical Characteristics RF RX Characteristics Operating Conditions: VDD = 3.0 to 3.6V, TA = 0C to +55 C, RF Freq = 57255875MHz, measured relative to the RF balun singleended I/O. Typical specifications at TA = 25C, VDD = 3.3V PARAMETER CONDITIONS MIN TYP MAX UNIT RF Channel Frequency Range Band1(lower band) RF I/O Impedance RX Sensitivity Max input signal Out-of-band blocker level Spurious RF outputs Band3/4(Upper band) ANT0,ANT1 SSC (single sub-carrier) LNA = low gain mode, min IF gain

<5150 MHz, >5850 MHz 2400-2483.5 MHz 5150-5850 MHz

<5150 MHz

>5850 MHz

*b : The sensitivity been defined with BER <= 0.002 5150 5725 5250 MHz 5875 MHz 50

-89 *b

-5

-45

-20

-55

-63

-63 ohm dBm dBm dBm dBm dBm dBm dBm 12 WL2SB21 Module Rev 1.0 6.5 Electrical Characteristics RF TX Characteristics Operating Conditions: VDD = 3.0 to 3.6V, TA = 0C to +55 C, RF Freq = 57255875MHz, measured relative to the RF balun singleended I/O. Typical specifications at TA = 25C, VDD = 3.3V PARAMETER CONDITIONS MIN TYP MAX UNIT RF Channel Frequency Range Band1(lower band) Band3/4(Upper band) ANT0,ANT1 SSC (single sub-carrier) 11.3 13.3 15.3

-20 5150 5725 5250 5875 50 MHz MHz ohm dBm dBc RF I/O Impedance TX Output power LO leakage 6.5.1 Measured at the worst performing frequency 6.6 Electrical Characteristics Audio C/CS PARAMETER CONDITIONS MIN TYP MAX UNIT 16 bit audio, 11KSps over-the-air sample rate 16 bit audio, 14.8KSps over-the- air sample rate 16 bit audio, 22KSps over-the-air sample rate 16 bit audio, 29.6KSps over-the- air sample rate 16 bit audio, 44KSps over-the-air sample rate Frequency Response

(-3dB) Gain Flatness1 0dB Input / Output Gain SNR THD+N Notes I2S Input / Output 20 20 20 20 20 93(1) 5K 6.5K 10K 13K 20K 0.2 94 Hz Hz Hz Hz Hz dB dB dB 1- 16-bit audio, all OTA sample rates. OTA 12-bit path for voice is possible, but will limit the SNR to 72dB. 13 WL2SB21 Module Rev 1.0 6.7 AV5100 Rate Converter Characteristics SRC Block Input Rates Output Rates SNR (dB) SRC BW (-3dB) SRC 0

(Audio) I2S 32-96K USB 8k 48K, ECU (TX) 11K 14.8k 22k 29.6k 44k I2S 32-96K USB 8k 48K, ECU (TX) 11K 14.8k 22k 29.6k 44k I2S 32-96K USB 8k 48K, ECU (TX) 14.8k SRC 1

(LFE) SRC 2

(Voice) All rates support 16bit, >93dB Actual bandwidth is dependent on the lower of the input or output rates. Output BW vs OTA 11k = 5kHz 14.8k = 6.5kHz 22k = 10kHz 29.6k = 13kHz 44k = 20kHz All rates support 16bit, >93dB Actual bandwidth is dependent on the lower of the input or output rates. Output BW vs OTA 11k = 5kHz 14.8k = 6.5kHz 22k = 10kHz 29.6k = 13kHz 44k = 20kHz Actual bandwidth is dependent on the lower of the input or output rates. Output BW vs OTA 11k = 5kHz 14.8k = 6.5kHz 22k = 10kHz 29.6k = 13kHz 44k = 20kHz All rates support 16bit, >93dB, but the OTA 12bit path will limit SNR to 72dB I2S Master: 48k Slave: 44.1K-96K ECU (TX) 11K 14.8k 22k 29.6k 44k I2S Master: 48k Slave: 44.1K-96K ECU (TX) 11K 14.8k 22k 29.6k 44k I2S Master: 48k Slave: 44.1K-96K USB 8k 48K, ECU (RX) 14.8k 14 6.8 I2C Master/Slave Communication Interface Timing (S_SCL, S_SDA) The SWA52-L1 has both I2C slave and master interfaces available with their respective pins S_SCL, S_SDA and M_SCL, M_SDA. The interfaces operate in I2C fast-mode and can receive and transmit at up to 400 kbit/s. Bytes are 8 bits long and are transferred with the most significant bit (MSB) first. Each byte has to be followed by an acknowledge bit. The SWA52-L1 will apply clock-stopping (by holding the clock line S_SCL LOW to force the master into a wait state) if necessary due to internal high-priority tasks. The slave/master interface can be used both for writing (e.g. sending commands) or reading (e.g. requesting status). An additional GPIO pin on the SWA52-L1 (Ex. GPIO24), can be used to notify the I2C master when a pending message is ready to be sent. The SWA52-L1 slave interface responds to the 7-bit slave address 1000000 (0x40) as shown in Figure 1 below. Figure 5: First Byte after the START Procedure ELECTRICAL SPECIFICATIONS AND TIMING Table 3: Characteristics of the S_SDA and S_SCL I/Os PARAMETER SYMBOL LOW level input voltage HIGH level input voltage LOW level output voltage (open drain or open collector) at 1 mA sink current:

Output fall time from VIHmin to VILmax with a bus capacitance from 10 pF to 400 pF Pulse width of spikes which must be suppressed by the input filter S_SCL clock frequency LOW period of the S_SCL clock HIGH period of the S_SCL clock Data hold time Data set-up time VIL VIH VOL tof tSP fSCL tLOW tHIGH tHD;DAT tSU;DAT FAST-MODE MIN. 0.3 2.0 0 0 0 0 1.3 0.6 100 100 MAX. 0.8 3.6 0.4 250 50 400 UNIT V V V ns ns kHz s s ns ns Figure 6: Definition of Timing for F/S-Mode Devices on the I2C-Bus 15 6.9 Packaging 16 7 Antenna specification 17 8 Ordering Information FCC Statement Federal Communication Commission Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate this equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and

(2) This device must accept any interference received, including interference that may cause undesired operation. Manufacturers integrating the Radio Module into other devices should note the following:

The device is compliant with part 15.407 of Title 47 of the FCC rules. If the Link Module is integrated into a new host product, the final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. This device uses various test mode programs for test set up which operate separate from production firmware. Host integrators should contact the grantee for assistance with test modes needed for module/host compliance test requirements. IC Statement This Class B digital apparatus complies with Canadian ICES-003. 5150-5250MHz is limited to use indoor only This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions:

(1) this device may not cause interference, and

(2) this device must accept any interference, including interference that may cause undesired operation of the device. Cet appareil est conforme aux normes CNR exemptes de licence dIndustrie Canada. Le fonctionnement est soumis aux deux conditions suivantes :

(1) cet appareil ne doit pas provoquer dinterfrences et

(2) cet appareil doit accepter toute interfrence, y compris celles susceptibles de provoquerun fonctionnement non souhait de lappareil. This Class B digital apparatus complies with Canadian ICES-003. Cetappareilnumrique de la classe B estconforme la norme NMB-003 du Canada.

-Label and Compliance Information The final end product must be labeled in a visible area with the following:

" Contains FCC ID: BEJ-WL2SB21".Contains IC: 2703H-WL2SB21 The grantee's FCC ID can be used only when all FCC/ IC compliance requirements are met.

-RF exposure The module will install into mobile device such as Sound Bar This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. Information on test modes and additional testing requirements

-OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed (for example, digital device emissions, PC peripheral requirements, additional transmitter in the host, etc.). 18

LG Electronics Inc. Wireless Audio Module Model : WL2SB21 Label Location Label Placement Location FCC ID Label Placement Location (EUT Bottom View) Label Format

Federal Communications Commission Authorization and Evaluation Division Date : 7 Sepember, 2022 ATTESTATION FCC ID: BEJ-WL2SB21 IC: 2703H-WL2SB21 Product descriotion: Wireless Audio Module We, LG Electronics USA hereby declare that the [Wireless Audio Module, WL2SB21]

for being in compliance with Section 3 of KDB 291074 D02 as below:

The EUT is a Indoor Client device will only associate indoor Subordinate. This client device is interconnected from another(RX or TX), not required AP device with Wi-Fi environment. Best regards _______________________________________ Sung Soo Kim Director, Regulatory and Environmental Affairs e LG Electronics Inc.

Authority to Act as Agent Date: August 31, 2022 American Certification Body, Inc. 6731 Whittier Avenue Suite C110 McLean, VA 22101 To Whom It May Concern:

______ AUDIX Technology Corporation ______ is authorized to act on our behalf, until otherwise notified, for applications to American Certification Body, Inc. (ACB). We certify that we are not subject to denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. Further, no party, as defined in 47 CFR 1.2002 (b), to the application is subject to denial of federal benefits, that includes FCC benefits. We also declare that the information provided to the FCC is true and correct to the best of our knowledge (47 CFR 2.911(d)) and we have been informed of the grantee responsibilities (47 CFR 2.909) with regard to certified equipment. Thank you, Agency Agreement Expiration Date: _____31 August, 2023_____ By:

(Signature1) _Sung Soo Kim__________________

(Print name) Title:

___Director, Regulatory and Environmental Affairs_ On behalf of: _____LG Electronics USA______

(Company Name) Telephone:

_____201-266-2215_______ 1 - Must be signed by applicant contact given for applicant on the FCC site, or by the authorized agent if an appropriate authorized agent letter has been provided. Letters should be placed on appropriate letterhead.

THIS MUST BE SIGNED BY THE APPLICANT/AGENT AND SHOULD BE PLACED ON APPROPRIATE LETTERHEAD Request for Modular/Limited Modular Approval Date: August 31, 2022 Subject: Manufacturers Declaration for - Modular Approval

- Split Modular Approval

- Limited Modular Approval - Limited Split Modular Approval Confidentiality Request for: ______BEJ-WL2SB21______ 8 Basic Requirements FCC Part 15.212(a)(1) For Items Marked NO(*), the Limited Module Description Must be Filled Out on the Following Pages Modular Approval Requirement Requirement Met 1. The modular transmitter must have its own RF shielding. This is intended to ensure that the module does not have to rely upon the shielding provided by the device into which it is installed in order for all modular transmitter emissions to comply with FCC limits. It is also intended to prevent coupling between the RF circuitry of the module and any wires or circuits in the device into which the module is installed. Such coupling may result in non-compliant operation. The physical crystal and tuning capacitors may be located external to the shielded radio elements. 15.212(a)(1)(i)

- YES - NO(*) Details: The module contains a metal shield which covers all RF components and circuitry. The shield is located on the top of the board next to antenna connector 2. The modular transmitter must have buffered modulation/data inputs (if such inputs are provided) to ensure that the module will comply with FCC requirements under conditions of excessive data rates or over-modulation. 15.212(a)(1)(ii)

- YES - NO(*) Details: The module contains its own buffered modulation. Please refer to Block Diagram filed with this application. 3. The modular transmitter must have its own power supply regulation on the module. This is intended to ensure that the module will comply with FCC requirements regardless of the design of the power supplying circuitry in the device into which the module is installed. 15.212(a)(1)(iii)

- YES - NO(*) Details: The module contains its own power supply regulation. Please refer to Block Diagram filed with this application. 4. The modular transmitter must comply with the antenna and transmission system requirements of 15.203, 15.204(b), 15.204(c), 15.212(a), and 2.929(b). The antenna must either be permanently attached or employ a unique antenna coupler (at all connections between the module and the antenna, including the cable). The professional installation provision of 15.203 is not applicable to modules but can apply to limited modular approvals under paragraph 15.212(b). 15.212(a)(1)(iv)

- YES - NO(*) Details: The module connects to its antenna using two PCB antennas which are considered a non-standard connector. A list of antennas tested and approved with this device may be found in users manual provided with the application. 5. The modular transmitter must be tested in a stand-alone configuration, i.e., the module must not be inside another device during testing. This is intended to demonstrate that the module is capable of complying with Part 15 emission limits regardless of the device into which it is eventually installed. Unless the transmitter module will be battery powered, it must comply with the AC line conducted requirements found in Section 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module (see Section 15.27(a)). The length of these lines shall be length typical of actual use or, if that length is unknown, at least 10 centimeters to insure that there is no coupling between the case of the module and supporting equipment. Any accessories, peripherals, or support equipment connected to the module during testing shall be unmodified or commercially available (see Section 15.31(i)). 15.212(a)(1)(v)

- YES - NO(*) Details: The module was tested stand-alone as shown in test setup photographs filed with this application. 070920-02b THIS MUST BE SIGNED BY THE APPLICANT/AGENT AND SHOULD BE PLACED ON APPROPRIATE LETTERHEAD Modular Approval Requirement 6. The modular transmitter must be labeled with its own FCC ID number, or use an electron display (see Requirement Met KDB Publication 784748). If using a permanently affixed label with its own FCC ID number, if the FCC ID is not visible when the module is installed inside another device, then the outside of the device into which the module is installed must also display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains Transmitter Module FCC ID: XYZMODEL1 or Contains FCC ID:

XYZMODEL1. Any similar wording that expresses the same meaning may be used. The Grantee may either provide such a label, an example of which must be included in the application for equipment authorization, or, must provide adequate instructions along with the module which explain this requirement. In the latter case, a copy of these instructions must be included in the application for equipment authorization. If the modular transmitter uses an electronic display of the FCC identification number, the information must be readily accessible and visible on the modular transmitter or on the device in which it is installed. If the module is installed inside another device, then the outside of the device into which the module is installed must display a label referring to the enclosed module. This exterior label can use wording such as the following: Contains FCC certified transmitter module(s). Any similar wording that expresses the same meaning may be used. The user manual must include instructions on how to access the electronic display. A copy of these instructions must be included in the application for equipment authorization. 15.212(a)(1)(vi)

- YES - NO(*) Details: There is a label on the module as shown in the labeling exhibit filed with this application. Host specific labeling instructions are shown in the installation manual .filed with this application. 7. The modular transmitter must comply with all specific rule or operating requirements applicable to the transmitter, including all the conditions provided in the integration instructions by the grantee. A copy of these instructions must be included in the application for equipment authorization. For example, there are very strict operational and timing requirements that must be met before a transmitter is authorized for operation under Section 15.231. For instance, data transmission is prohibited, except for operation under Section 15.231(e), in which case there are separate field strength level and timing requirements. Compliance with these requirements must be assured. 15.212(a)(1)(vii) Details: The module complies with FCC Part 15E requirements. Instructions to the OEM installer are provided in the installation manual filed with this application. 8. The modular transmitter must comply with any applicable RF exposure requirements. For example, FCC Rules in Sections 2.1091, 2.1093 and specific Sections of Part 15, including 15.319(i), 15.407(f), 15.253(f) and 15.255(g), require that Unlicensed PCS, UNII and millimeter wave devices perform routine environmental evaluation for RF Exposure to demonstrate compliance. In addition, spread spectrum transmitters operating under Section 15.247 are required to address RF Exposure compliance in accordance with Section 15.247(b)(4). Modular transmitters approved under other Sections of Part 15, when necessary, may also need to address certain RF Exposure concerns, typically by providing specific installation and operating instructions for users, installers and other interested parties to ensure compliance. 15.212(a)(1)(viii) Details: The module use more than 20cm distance.

- YES - NO(*)

- YES - NO(*) 070920-02b THIS MUST BE SIGNED BY THE APPLICANT/AGENT AND SHOULD BE PLACED ON APPROPRIATE LETTERHEAD Limited Module Description When Applicable

* If a module does NOT meet one or more of the above 8 requirements, the applicant may request Limited Modular Approval (LMA). This Limited Modular Approval (LMA) is applied with the understanding that the applicant will demonstrate and will retain control over the final installation of the device, such that compliance of the end product is always assured. The operating condition(s) for the LMA;

the module is only approved for use when installed in devices produced by grantee. A description regarding how control of the end product, into which the module will be installed, will be maintained by the applicant/manufacturer, such that full compliance of the end product is always ensured should be provided here. Details: N/A Software Considerations KDB 594280 / KDB 442812 (One of the following 2 items must be applied) Requirement 1. For non-Software Defined Radio transmitter modules where software is used to ensure compliance of the device, technical description must be provided about how such control is implemented to ensure prevention of third-party modification; see KDB Publication 594280. Requirement Met

- Provided in Separate Cover Letter

- N/A Details: Please refer to Operational Description-Software Configuration Control Declaration. 2. For Software Defined Radio (SDR) devices, transmitter module applications must provide a software security description; see KDB Publication 442812.

- Provided in Separate Cover Letter

- N/A Details: N/A Split Modular Requirements Requirement Provided in Manual 1. For split modular transmitters, specific descriptions for secure communications between front-end and control sections, including authentication and restrictions on third-party modifications; also, instructions to third-party integrators on how control is maintained.

- Provided in Separate Cover Letter

- N/A Details: N/A 070920-02b THIS MUST BE SIGNED BY THE APPLICANT/AGENT AND SHOULD BE PLACED ON APPROPRIATE LETTERHEAD OEM Integration Manual Guidance KDB 996369 D03 Section 2 Clear and Specific Instructions Describing the Conditions, Limitations, and Procedures for third-parties to use and/or integrate the module into a host device. Requirement Is this module intended for sale to third parties?

- YES

- No, If No, and LMA applies, the applicant can optionally choose to not make the following detailed info public. However there still needs to be basic integration instructions for a users manual and the information below must still be included in the operational description. If the applicant wishes to keep this info confidential, this will require a separate statement cover letter explaining the module is not for sale to third parties and that integration instructions are internal confidential documents. Items required to be in the manual See KDB 996369 D03, Section 2 As of May 1, 2019, the FCC requires ALL the following information to be in the installation manual. Modular transmitter applicants should include information in their instructions for all these items indicating clearly when they are not applicable. For example information on trace antenna design could indicate Not Applicable. Also if a module is limited to only a grantees own products and not intended for sale to third parties, the user instructions may not need to be detailed and the following items can be placed in the operational description, but this should include a cover letter as cited above. 1. List of applicable FCC rules. KDB 996369 D03, Section 2.2 a. Only list rules related to the transmitter. 2. Summarize the specific operational use conditions. KDB 996369 D03, Section 2.3 a. Conditions such as limits on antennas, cable loss, reduction of power for point to point 3. Limited Module Procedures. KDB 996369 D03, Section 2.4 systems, professional installation info a. Describe alternative means that the grantee uses to verify the host meets the necessary limiting conditions b. When RF exposure evaluation is necessary, state how control will be maintained such that compliance is ensured, such as Class II for new hosts, etc. 4. Trace antenna designs. KDB 996369 D03, Section 2.5 a. Layout of trace design, parts list, antenna, connectors, isolation requirements, tests for design verification, and production test procedures for ensuring compliance. If confidential, the method used to keep confidential must be identified and information provided in the operational description. 5. RF exposure considerations. KDB 996369 D03, Section 2.6 a. Clearly and explicitly state conditions that allow host manufacturers to use the module. Two types of instructions are necessary: first to the host manufacturer to define conditions (mobile, portable xx cm from body) and second additional text needed to be provided to the end user in the host product manuals. 6. Antennas. KDB 996369 D03, Section 2.7 a. List of antennas included in the application and all applicable professional installer instructions when applicable. The antenna list shall also identify the antenna types

(monopole, PIFA, dipole, etc note that omni-directional is not considered a type) 7. Label and compliance information. KDB 996369 D03, Section 2.8 a. Advice to host integrators that they need to provide a physical or e-label stating Contains FCC ID: with their finished product 8. Information on test modes and additional testing requirements. KDB 996369 D03, Section 2.9 a. Test modes that should be taken into consideration by host integrators including clarifications necessary for stand-alone and simultaneous configurations. b. Provide information on how to configure test modes for evaluation 9. Additional testing, Part 15 Subpart B disclaimer. KDB 996369 D03, Section 2.10

- All Items shown to the left are provided in the Modular Integration Guide (or UM) for Full Modular Approval (MA) or LMA.

- An LMA applies and is approved ONLY for use by the grantee in their own products, and not intended for sale to 3rd parties as provided in a separate cover letter. Therefore the information shown to the left is found in the theory of operation. Sincerely, By:

(Signature/Title1) _______Johnny Hsueh_____________

(Print name) 1 - Must be signed by applicant contact given for applicant on the FCC site, or by the authorized agent if an appropriate authorized agent letter has been provided. Letters should be placed on appropriae letterhead. 070920-02b

Request for Confidentiality Date: August 31, 2022 Subject: Confidentiality Request for: FCC ID: BEJ-WL2SB21 / IC: 2703H-WL2SB21 Pursuant to FCC 47 CFR 0.457(d) and 0.459 and IC RSP-100, Section 12.4, the applicant requests that a part of the subject FCC application be held confidential. Type of Confidentiality Requested Short Term Short Term Short Term Short Term Short Term Short Term Short Term Short Term Short Term Permanent Permanent *1 Permanent Permanent Permanent Permanent Permanent *3 Exhibit Block Diagrams External Photos Internal Photos Operation Description/Theory of Operation Parts List & Placement/BOM Tune-Up Procedure Schematics Test Setup Photos Users Manual ______ LG Electronics Inc. ______ has spent substantial effort in developing this product and it is one of the first of its kind in industry. Having the subject information easily available to "competition" would negate the advantage they have achieved by developing this product. Not protecting the details of the design will result in financial hardship. Permanent Confidentiality:

The applicant requests the exhibits listed above as permanently confidential be permanently withheld from public review due to materials that contain trade secrets and proprietary information not customarily released to the public. Short-Term Confidentiality for FCC Applications:

The applicant requests the exhibits selected above as short term confidential be withheld from public view for a period of 180 days from the date of the Grant of Equipment Authorization and prior to marketing. This is to avoid premature release of sensitive information prior to marketing or release of the product to the public. Applicant is also aware that they are responsible to notify ACB in the event information regarding the product or the product is made available to the public before the requested period has expired. ACB will then release the documents listed above for public disclosure pursuant to FCC Public Notice DA 04-1705. Short Term Confidentiality for Industry Canada Applications:

Starting May 2022, ISED will recognize short term confidentiality on certain exhibits until the intended date of marketing. The applicant requests the exhibits selected above as short term confidential be withheld from public view until: 180 days Sincerely, By:

(Signature/Title2) _______Sung Soo Kim __________________

(Print name) 1 - The asterisked items (*) require further information to be provided to ACB before permanent confidentiality will beextended to these exhibits. Please refer to FCC KDB 726920 and the specific Document link for D01 found at:

https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=41731 and review section II, 3) regarding specific information that must accompany these requests. 2 - Must be signed by applicant contact given for applicant on the FCC site, or by the authorized agent if an appropriate authorized agent letter has been provided. Letters should be placed on appropriate letterhead. 050222-31a