FCC ID: BEJ-WL1BKR22 Wireless Audio Module

WL1BKT22 Operation description WL1BKT22 Operation description

First: the module is powered on and started by 3.3V;

First: the module is powered on and started by 3.3V;

Second: the host transmits the audio signal to the module through I2S;

Second: the host transmits the audio signal to the module through I2S;

Third: THE MCU CC2538 on the module decodes the I2S audio signal, and then transmits the decoded audio Third: THE MCU CC2538 on the module decodes the I2S audio signal, and then transmits the signal to the BK5813 RF chip on the module through SPI;

decoded audio signal to the BK5813 RF chip on the module through SPI;

Fourth: the BK5813 RF chip on the module transmits the audio through wireless transmission;

Fourth: the BK5813 RF chip on the module transmits the audio through wireless transmission;

Fifth: there is I2C communication between the module and the host, both sides obtain the status and control Fifth: there is I2C communication between the module and the host, both sides obtain the status and through I2C;

control through I2C;

The product automatically stops the transmission if the information fails to be transferred or the operation fails. The product automatically stops the transmission if the information fails to be transferred or the operation fails.

WL1BKT22 as the main device

WL1BKT22 as the main device WL1BKR22 Operation description

WL1BKR22 Operation description

First: The module is powered on and started by 3.3V;

Second: The BK5813 RF chip on the module receives the audio signal transmitted by the transmitting module through wireless transmission;

Third: MCU CC2538 on the module obtains the audio received by BK5813 through SPI;

Fourth: MCU CC2538 decodes the acquired audio signal and transmits the audio to the power amplifier on the subwoofer power amplifier board through I2S;

Fifth: There is I2C communication between the module and the subwoofer power amplifier board, initializing the power amplifier on the subwoofer power amplifier board, and I0 port communication between the module and the subwoofer power amplifier board, controlling the power amplifier switch and LED state display. First: The module is powered on and started by 3.3V;

Second: The BK5813 RF chip on the module receives the audio signal transmitted by the transmitting module through wireless transmission;

Third: MCU CC2538 on the module obtains the audio received by BK5813 through SPI;;

Fourth: MCU CC2538 decodes the acquired audio signal and transmits the audio to the power amplifier on the subwoofer power amplifier board through I2S;

Fifth: There is I2C communication between the module and the subwoofer power amplifier board, initializing the power amplifier on the subwoofer power amplifier board, and I0 port communication between the module and the subwoofer power amplifier board, controlling the power amplifier switch and LED state display.

WL1BKR22 is a client device controlled by the WL1BKT2. WL1BKT22 device is classified as a master device. WL1BKR22 is classified as a Client device under the control of the WL1BKT22.

WL1BKR22 is a client device controlled by the WL1BT22.

The product automatically stops the transmission if the information fails to be transferred or the operation fails. WL1BT22 device is classified as a transceiver device. WL1BR22 is classified as a Client device under the control of the WL1BT22. ISED RSS-247 (6.4) required by the technology When there is no information to transmit or an operation fails, the device automatically discontinue transmission. After The product automatically stops the transmission if the information fails to be transferred or the operation the transmission is discontinued, the TX module enters the reconnection state until it is reconnected or the power fails. supply is switched off passively. After the transmission is discontinued, the RX module enters the RE-connection state for one minute, IF no connection, enters the standby mode after one minute. ISED RSS-247 (6.4) required by the technology FCC 15.407 (c) required by the technology When there is no information to transmit or an operation fails, the device automatically discontinue The device would automatically discontinue transmission if there is no information to transmit or if the operation fails. transmission. After the transmission is discontinued, the TX module enters the reconnection state until it After the transmission is discontinued, the TX module enters the reconnection state until it is reconnected or the power is reconnected or the power supply is switched off passively. After the transmission is discontinued, the supply is switched off passively. After the transmission is discontinued, the RX module enters the RE-connection state RX module enters the connection state for one minute, and enters the standby mode after one minute. for one minute, IF no connection, enters the standby mode after one minute. FCC 15.407 (c) required by the technology WL1BKT22 (TX module):

The device would automatically discontinue transmission if there is no information to transmit or if the The reconnection state is TX will transmit control signal to RX for pair each other. operation fails. After the transmission is discontinued, the TX module enters the reconnection state until it The TX re-try to transmit control signal to RX on complete frame or burst intervals until they connect successfully or is reconnected or the power supply is switched off passively. After the transmission is discontinued, the RX power supply be off passively. module enters the connection state for one minute, and enters the standby mode after one minute. WL1BKR22 (RX module):

The connection state is no transmit data by RX module. Its only permit to transmit the information that is repetitive The module-[WL1BT22] is installed in the speaker, and the signal of the sound is provided through the HDMI or Optical ports of the TV audio products; When the speaker receive the sound signal, it will codes to TX on complete frame or burst intervals. transmit the sound signal to another speaker (which is installed with the module-[WL1BR22]). The standby mode is enter sleep mode to save consumption power. On this mode, the RX doesnt transmit any information or data to TX. The module-[WL1BKT22] is installed in the speaker, and the signal of the sound is provided through the HDMI or Optical ports of the TV audio products; When the speaker receive the sound signal, it will transmit the sound signal to another speaker (which is installed with the module-[WL1BKR22]).

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:

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

n experienced radio/TV technician for help. FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void

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. 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 deux conditions suivantes :

(2) cet appareil doit accepter toute interfrence, y compris celles susceptibles de provoquerun fonctionnement non

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:

BEJ-WL1BKT22BEJ-WL1BKR22

2703H-WL1BKT222703H-WL1BKR22 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.).

Wireless Audio Module, WL1BKT22 Antenna #1 Antenna #2 No. Antenna Part Number Manufacturer Antenna Type Frequency (MHz) Max Gain(dBi) 1. Antenna #1 N/A PCB Printing Antenna 5150 5170 5190 5210 5230 5250 5450 5470 5490 5500 5750 5770 5790 5810 5830 5850 2.66 2.87 2.94 3.25 3.23 3.11 2.98 2.98 2.77 2.59 2.38 2.38 2.48 2.33 2.37 2.22 No. Antenna Part Number Manufacturer Antenna Type Frequency (MHz) Max Gain(dBi) 2. Antenna #2 N/A PCB Printing Antenna 5150 5170 5190 5210 5230 5250 5450 5470 5490 5500 5750 5770 5790 5810 5830 5850 3.57 3.35 3.42 3.69 4.00 3.94 3.32 3.48 3.37 3.42 3.98 4.05 3.79 3.94 4.20 4.09

LG Electronics Inc. Wireless Audio Module Model : WL1BKR22 Label Location Label Placement Location FCC ID Label Placement Location (EUT Bottom View) Label Format

Date : Nov. 9, 2017 Rev : 2.3 FCC Agent Authorization Letter HACS-F004 FCC Agent Authorization Letter HCT America LLC

(TCB@hctamerica.com) 1726 Ringwood Avenue San Jose, CA 95131 TEL: +1.510.933.8848, Fax: +1.510.933.8849 Page 1 of 2 This document is electronically controlled. Hard copy documents are uncontrolled. Please check all hard copies against the controlled electronic copy to ensure validity. This document is the confidential property of HCT America LLC. It may not be forwarded or reproduced in whole or in part without written permissions from HCT America LLC Date : Nov. 9, 2017 Rev : 2.3 REVISION TABLE Rev 1.0 2.0 2.1 2.2 2.3 Description of Change Original Release(Obsolete) Updated template(Obsolete) Updated address(Obsolete) Updated address Fixed Typo Agent Date 06/14/2012 10/01/2012 01/10/2014 11/18/2016 11/09/2017 Approved QM QM QM QM QM HACS-F004 FCC Agent Authorization Letter HCT America LLC

(TCB@hctamerica.com) 1726 Ringwood Avenue San Jose, CA 95131 TEL: +1.510.933.8848, Fax: +1.510.933.8849 Page 2 of 2 This document is electronically controlled. Hard copy documents are uncontrolled. Please check all hard copies against the controlled electronic copy to ensure validity. This document is the confidential property of HCT America LLC. It may not be forwarded or reproduced in whole or in part without written permissions from HCT America LLC DATE : 24 June 2022 To:

Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD To whom it may concern:

Subject : FCC Agent Authorization Letter for FCC ID : BEJ-WL1BKR22 We, the undersigned, hereby authorize AUDIX Technology Corporation to act on our behalf in all manners relating to application for equipment authorization, including signing of all documents relating to these matters. Any and all acts carried out by AUDIX Technology Corporation on our behalf shall have the same effect as acts of our own. We, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 853(a). We recognize that we are still responsible for the terms and conditions outlined in the HCT America Client Services Agreement. This authorization is valid until further written notice from the applicant. Sincerely, Signed by:

Company Name: LG Electronics USA Company Address: 111 Sylvan Avenue, North Building, Englewood Cliffs, NJ 07632 Contact Name / Title: Sung Soo Kim / Director, Regulatory and Environmental Affairs HACS-F004 FCC Agent Authorization Letter Rev : 2.3

Date : Nov. 09, 2017 Rev : 3.0 FCC Confidentiality Request Letter HACS-F003 FCC Confidentiality Request Letter HCT America LLC

(TCB@hctamerica.com) 1726 Ringwood Avenue San Jose, CA 95131 TEL: +1.510.933.8848, Fax: +1.510.933.8849 Page 1 of 2 This document is electronically controlled. Hard copy documents are uncontrolled. Please check all hard copies against the controlled electronic copy to ensure validity. This document is the confidential property of HCT America LLC. It may not be forwarded or reproduced in whole or in part without written permissions from HCT America LLC Date : Nov. 09, 2017 Rev : 3.0 REVISION TABLE Rev 1.0 2.0 2.1 2.2 3.0 Description of Change Original Release(Obsolete) Updated template(Obsolete) Updated address(Obsolete) Updated address Updated LTC and STC Confidentiality table Date 06/14/2012 10/01/2012 01/10/2014 11/18/2016 11/09/2017 Approved QM QM QM QM QM HACS-F003 FCC Confidentiality Request Letter HCT America LLC

(TCB@hctamerica.com) 1726 Ringwood Avenue San Jose, CA 95131 TEL: +1.510.933.8848, Fax: +1.510.933.8849 Page 2 of 2 This document is electronically controlled. Hard copy documents are uncontrolled. Please check all hard copies against the controlled electronic copy to ensure validity. This document is the confidential property of HCT America LLC. It may not be forwarded or reproduced in whole or in part without written permissions from HCT America LLC DATE : 24 June 2022 To: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD SUBJECT : Request for Confidentiality for FCC ID : BEJ-WL1BKR22 We hereby request confidential treatment of the information accompanying this application as outlined below:

LONG-TERM AND SHORT-TERM CONFIDENTIAL LIST Description LONG-TERM CONFIDENTIAL SHORT-TERM CONFIDENTIAL

(180 DAYS) Exhibit 1 2 3 4 5 5 6 7 8 Block Diagram Schematics Operational Description Parts List PCB Layout External Photos Internal Photos Test-Setup Photos Users Manual The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 & 0.459 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Signed by:

Company Name: LG Electronics USA Company Address: 111 Sylvan Avenue, North Building, Englewood Cliffs, NJ 07632 Contact Name / Title: Sung Soo Kim / Director, Regulatory and Environmental Affairs HACS-F003 FCC Confidentiality Request Letter Rev : 3.0

Date : Jul. 16, 2018 Rev : 3.2 Modular Approval Declaration Letter HACS-F007 Modular Approval Declaration Letter HCT America LLC

(TCB@hctamerica.com) 1726 Ringwood Ave., San Jose, CA 95131 TEL: +1.510.933.8848, Fax: +1.510.933.8849 This document is electronically controlled. Hard copy documents are uncontrolled. Please check all hard copies against the controlled electronic copy to ensure validity. This document is the confidential property of HCT America LLC. It may not be forwarded or reproduced in whole or in part without written permissions from HCT America LLC Page 1 of 2 Date : Jul. 16, 2018 Rev : 3.2 REVISION TABLE Rev 1.0 2.0 2.1 3.0 3.1 3.2 Description of Change Original Release(Obsolete) Updated Template(Obsolete) Updated address (Obsolete) Updated Template(Obsolete) Updated Address Changed File Name and Split Files FCC/IC Date Approved 06/14/2012 10/01/2012 01/10/2014 03/30/2015 06/21/2018 7/16/2018 QM QM QM QM QM QM HACS-F007 Modular Approval Declaration Letter HCT America LLC

(TCB@hctamerica.com) 1726 Ringwood Ave., San Jose, CA 95131 TEL: +1.510.933.8848, Fax: +1.510.933.8849 This document is electronically controlled. Hard copy documents are uncontrolled. Please check all hard copies against the controlled electronic copy to ensure validity. This document is the confidential property of HCT America LLC. It may not be forwarded or reproduced in whole or in part without written permissions from HCT America LLC Page 2 of 2 Date : 24 June 2022 FCC Modular Approval Attestation FCC ID: BEJ-WL1BKR22 is seeking FCC equipment authorization as Single Modular Transmitter Single Limited Modular Transmitter Product Information Product Description:

Wireless Audio Module FRN:

0017130477 Model Name(s):

WL1BKR22 FCC Product ID:

FCC Module ID:

BEJ-WL1BKR22 BEJ-WL1BKR22 Modular Checklist/Information For Modular Approval, the module shall meet all the requirements listed below. Please check () if the module complies with the stated requirement. The modular transmitter must have its own shielding. The modular transmitter must have buffered modulation/data inputs. The modular transmitter must have its own power supply regulation. The modular transmitter must comply with the antenna requirements of section 15.203 and 15.204(c). The modular transmitter must tested in a stand-alone configuration. The modular transmitter must be labeled with its own FCC ID number. The modular transmitter must comply with any specific rule or operating requirements applicable to the transmitter and the manufacturer must provide adequate instruction along with the module to explain any such requirements. The modular transmitter must comply with any applicable RF exposure requirements. If a module(s) does NOT meet one or more of the above listed requirements, the applicant may request Limited Modular Approval (LMA). For LMA, please state details about why the above requirement(s) could not be met; and state 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:

Company Name: LG Electronics USA Company Address: 111 Sylvan Avenue, North Building, Englewood Cliffs, NJ 07632 Contact Name / Title: Director, Regulatory and Environmental Affairs HACS-F007-1 FCC Modular Approval Declaration Letter Rev : 3.2