FCC ID: 2AOKI-WFM620RSD2 WF-M620-RSD2

AI-Link WF-M620-RSD2 Features Supported WLAN Standards IEEE Std. 802.11a IEEE Std. 802.11b IEEE Std. 802.11g IEEE Std. 802.11n Chip Solution MTK MT3620AN Size 24.0mm*27.0mm*2.5mm Installation Band Data Rate(max) Antenna Interface SMD 72.2Mbps 2.4 GHz/5 GHz IPEX Note DC 3.3V Power Supply Sichuan AI-Link Technology Co.,Ltd Add: Anzhou,Industrial park,Mianyang,Sichuan Web: http://www.ailinkiot.com Tel: +86-15196265565 WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module Feedback of customers Confirmation We accept the specification after Confirmed Customer name Customer signature Confirmation Date Please feed back this paper and first paper after your signature by the address,thanks!

ADD Anzhou,Industrial park,Mianyang,Sichuan Factory Sichuan AI-Link Technology Co.,Ltd. Approved Checked Designed Product WiFi Module Feng Yi Ding Shuangpeng Feng Jie Model WF-M620-RSD2 Date 2020-5-30 Sichuan AI-Link Technology Co., Ltd. page 2 of 16 WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module No Draft v1.0 Date of modification 20200530 Record of Modification Main content of modification Reason of modification Serial number of modification Confirm Feng Jie Sichuan AI-Link Technology Co., Ltd. page 3 of 16 WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module 1. Brief Description The WF-M620-RSD2 IoT module is based on the MediaTek MT3620AN,a highly integrated single chip,tricore WIFI MCU designed to meet the requirements of modern robust internet-connected devices.It leverages the Microsoft Azure Sphere security architecture to provide an unprecedented level of security to connected device manufacturers.For the the device the Azure Sphere system provides device authentication and attestation,supports remote lifetime of over-the-air software updates to maintain security in the face of evolving attacks,and automates error logging and reporting. 1.1 Block Diagram 1.2 WIFI Feature Single band 2.4/5 GHz ISM Supported IEEE 802.11a/b/g/n 1.3 Hardware Feature No. 1 2 3 4 5 6 7 8 9 10 11 Feature Main Chip RAM Capacity NOR-flash Capacity Form Factor Size Interface Operation Voltage Description MT3620AN approximately 5MB(including 256KB in each I/O subsystem and 4MB in the A7 application subsystem) 16MB on-die and no external flash(The amount of flash that will be accessible to customer software is TBD) 74 pins(stamp hole) 24 x 27 x 2.5mm0.2mm UART5ISU0,ISU1,ISU2,ISU3,ISU4 I2S1I2S0 PWM6PWM0~PWM5 ADC4ADC0~3 GPIO36 GPIO pins with multi-functions 3.3V+/-0.3 Current Consumption TX Avg 151mA @11b 11M 17dBm Antenna Type IPEX connector for external antenna Operating Temperature

-40C to +85C Storage Temperature

-45C to +135C Sichuan AI-Link Technology Co., Ltd. page 4 of 16 2. Mechanical Specification(units:mm) 2.1 Mechanical Outline WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module Top View Side View Bottom View 2.2 Pin Definition Figure 2.2 Pin assignment Sichuan AI-Link Technology Co., Ltd. page 5 of 16 WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module Pin#

1 Pin name Type P Ground Ground Description GND GND 3V3 3V3 GPIO0/PWM0 GPIO1/PWM1 GPIO2/PWM2 GPIO3/PWM3 GPIO4/PWM4 GPIO5/PWM5 GPIO26/SCLK0/TXD0 GPIO27 /MOSI0/RTS0/SCL0 GPIO28/MISO0/RXD0/SDA0 GPIO29/CSA0/CTS0 GPIO31/SCLK1/TXD1 GPIO32/MOSI1/RTS1/SCL1 GPIO33/MISO1/RXD1/SDA1 GPIO34/CSA1/CTS1 GND GND GPIO36/SCLK2/TXD2 GPIO37/MOSI2/RTS2/SCL2 GPIO38/MISO2/RXD2/SDA2 GPIO39/CSA2/CTS2 GPIO41/ADC0 GPIO42/ADC1 GPIO43/ADC2 GPIO44/ADC3 VREF_ADC EXT_PMU_EN WAKEUP AVDD_3V3_RTC VOUT_2V5 PMU_EN DEBUG_CTS DEBUG_RXD DEBUG_RTS DEBUG_TXD GND GND 3V3 3V3 SWD_DIO SWD_CLK SWO 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 P PI PI DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO P P DIO DIO DIO DIO AI DO DI PI PO DI DI DI DO DO P P PI PI DIO DI DO DC 3.3V Power Supply DC 3.3V Power Supply Interrupt-capable GPIO multiplexed with PWM output Interrupt-capable GPIO multiplexed with PWM output Interrupt-capable GPIO multiplexed with PWM output Interrupt-capable GPIO multiplexed with PWM output Interrupt-capable GPIO multiplexed with PWM output Interrupt-capable GPIO multiplexed with PWM output GPIO multiplexed with ISU0[1] functions(SPI CLK/UART TX) GPIO multiplexed with ISU0 functions(SPI MOSI/UART RTS/I2C CLK) GPIO multiplexed with ISU0 functions(SPI MISO/UART RX/I2C DATA) GPIO multiplexed with ISU0 functions(SPI CSA/UART CTS) GPIO multiplexed with ISU1 functions(SPI CLK/UART TX) GPIO multiplexed with ISU1 functions(SPI MOSI/UART RTS/I2C CLK) GPIO multiplexed with ISU1 functions(SPI MISO/UART RX/I2C DATA) GPIO multiplexed with ISU1 functions(SPI CSA/UART CTS) Ground Ground GPIO multiplexed with ISU2 functions(SPI CLK/UART TX) GPIO multiplexed with ISU2 functions(SPI MOSI/UART RTS/I2C CLK) GPIO multiplexed with ISU2 functions(SPI MISO/UART RX/I2C DATA) GPIO multiplexed with ISU2 functions(SPI CSA/UART CTS) ADIO ADIO ADIO ADIO GPIO multiplexed with ADC input GPIO multiplexed with ADC input GPIO multiplexed with ADC input GPIO multiplexed with ADC input Reference voltage input for ADC[2]

External power supply enable output External wakeup from RTC mode (deepest sleep mode) Power rail for real-time clock[3]

Output from internal 2.5V LDO Internal PMU override. If driven low, MT3620 is turned off and in a very low power state, equivalent to RTC mode power consumption. Only the PMU quiescent current will be drawn. When released, the PMU will start up. Azure Sphere OS debug CTS Debug UART is for Microsoft use only. Azure Sphere OS debug RXD Azure Sphere OS debug RTS/

Strapping pin when MT3620 boot up Azure Sphere OS debug TXD Ground Ground DC 3.3V Power Supply DC 3.3V Power Supply ARM SWD data ARM SWD clock ARM SWO debug output SWD is used for programming and debugging the 2X Cortex-M4 on MT3620.A single SWD channel is shared between two Cortex-M4. Sichuan AI-Link Technology Co., Ltd. page 6 of 16 WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 GPIO56/TX0 GPIO57/MCLK0 GPIO58/FS0 GPIO59/RX0 GPIO60/BCLK0 GPIO66/SCLK3/TXD3 GPIO67/MOSI3/RTS3/SCL3 GPIO68/MISO3/RXD3/SDA3 GPIO69/CSA3/CTS3 GPIO70/CSB3 GPIO72/MOSI4/RTS4/SCL4 GPIO73/MISO4/RXD4/SDA4 GND GND GND GND SYSRST_N SERVICE_TXD SERVICE_RTS SERVICE_RXD SERVICE_CTS RECOVERY_RXD RECOVERY_TXD RECOVERY_RTS RECOVERY_CTS IO0_GPIO85/IO0_RXD IO0_GPIO86/IO0_TXD GND GND DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO DIO P P P P DI DO DO DI DI DI DO DO DI DI DO P P GPIO multiplexed with I2S 0 GPIO multiplexed with I2S 0 GPIO multiplexed with I2S 0 GPIO multiplexed with I2S 0 GPIO multiplexed with I2S 0 GPIO multiplexed with ISU3 functions(SPI CLK/UART TX) GPIO multiplexed with ISU3 functions(SPI MOSI/UART RTS/I2C CLK) GPIO multiplexed with ISU3 functions(SPI MISO/UART RX/I2C DATA) GPIO multiplexed with ISU3 functions(SPI CSA/UART CTS) GPIO multiplexed with ISU3 functions(SPI CSB) GPIO multiplexed with ISU4 functions(SPI MOSI/UART RTS/I2C CLK) GPIO multiplexed with ISU4 functions(SPI MISO/UART RX/I2C DATA) Ground Ground Ground Ground System reset,active low. Azure Sphere Service UART TXD Azure Sphere Service UART RTS Azure Sphere Service UART RXD Azure Sphere Service UART CTS Service UART is the main interface for PC to communicate with the Azure Sphere OS.Core A7 app debugging, sideload, manufacturing test, getting device ID operation all use the Service UART port. Azure Sphere flash re-imaging Recovery UART RXD Azure Sphere flash re-imaging Recovery UART TXD Azure Sphere flash re-imaging Recovery UART RTS Azure Sphere flash re-imaging Recovery UART CTS Recovery UART is for upgrading the Azure Sphere OS without connection to the Internet. Dedicated GPIO multiplexed with UART for I/O CM4F 0 Dedicated GPIO multiplexed with UART for I/O CM4F 0 Ground Ground Note 1.ISU is a serial communication block which can be configured as I2C master. I2C slave, SPI master, SPI slave, or UART; I2C runs at up to 1MHz, SPI at up to 40MHz, and UARTs at up to 3Mbps. 2.The MT3620AN ADC VREF maximum is 2.5V.Should not input >2.5V when using the ADC because the ADC will not read any value higher than 2.5V.If the ADC pin is not configured for ADC operation,then 3.3V input is ok. 3.WF-M620-RSD2 RTC functionality is enabled, the AVDD_3V3_RTC must be always powered, or the MT3620 will hang up during the system boot procedure. 4.The power supply for all GPIO pins is 3.3V. Sichuan AI-Link Technology Co., Ltd. page 7 of 16 2.3 Product Pictures WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module TOP VIEW BOTTOM VIEW 3. RF Characteristics:

3-1 IEEE 802.11b Section:

Items Specification Mode Channel Data rate TX Characteristics 1. Power Levels(Calibrated) 1) for each data rate 2. Spectrum Mask @ target power 1) fc +/-11MHz to +/-22MHz 2) fc > +/-22MHz 3 Constellation Error(EVM)@ target power 1) 1Mbps 2) 2Mbps 3) 5.5Mbps 4) 11Mbps 4. Frequency Error RX Characteristics 5 Minimum Input Level Sensitivity(each chain) 1) 1Mbps (FER 8%) 2) 2Mbps (FER 8%) 3) 5.5Mbps (FER 8%) 4) 11Mbps (FER 8%) 6 Maximum Input Level (FER 8%) Contents IEEE802.11b CCK CH1 to CH13 1, 2, 5.5, 11Mbps Max. Min. Typ. Unit Remark 15

-10 Min.

-10 17

-23

-23

+2 Typ.

-98

-95

-93

-90

19

-30

-50

-10

-10

-10

-10 10 Max.

-95

-93

-91

-88

dBm dBr dBr dB dB dB dB ppm Unit dBm dBm dBm dBm dBm Sichuan AI-Link Technology Co., Ltd. page 8 of 16 3-2 IEEE 802.11g Section:

Items Specification Mode Channel Data rate TX Characteristics 1. Power Levels 1) For Each data rate 2. Spectrum Mask @ target power 1) at fc +/-11MHz 2) at fc +/-20MHz 3) at fc > +/-30MHz 3 Constellation Error(EVM)@ target power 1) 6Mbps 2) 9Mbps 3) 12Mbps 4) 18Mbps 5) 24Mbps 6) 36Mbps 7) 48Mbps 8) 54Mbps 4 Frequency Error RX Characteristics 5 Minimum Input Level Sensitivity(each chain) 1) 6Mbps (PER 10%) 2) 9Mbps (PER 10%) 3) 12Mbps (PER 10%) 4) 18Mbps (PER 10%) 5) 24Mbps (PER 10%) 6) 36Mbps (PER 10%) 7) 48Mbps (PER 10%) 8) 54Mbps (PER 10%) 6 Maximum Input Level (PER 10%) WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module Contents IEEE802.11g OFDM CH1 to CH13 6, 9, 12, 18, 24, 36, 48, 54Mbps Max. Typ. Unit Remark 13 15 Min.

-10 Min.

-20 17

-20

-28

-40

-5

-8

-10

-13

-16

-19

-22

-25 10 Max.

-92

-90

-88

-86

-83

-81

-76

-74

dBm dBr dBr dBr dB dB dB dB dB dB dB dB ppm Unit dBm dBm dBm dBm dBm dBm dBm dBm dBm

-31

-35

+2 Typ.

-95

-92

-90

-88

-85

-83

-78

-76

Sichuan AI-Link Technology Co., Ltd. page 9 of 16 WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module Contents IEEE802.11n HT20 @ 2.4GHz OFDM CH1 to CH13 MCS0/1/2/3/4/5/6/7 Max. Typ. Unit Remark 3-3 IEEE 802.11n HT20 Section:

Items Specification Mode Channel Data rate (MCS index) TX Characteristics 2. Power Levels 1) For Each antenna port 3. Spectrum Mask @target power 1) at fc +/-11MHz 2) at fc +/-20MHz 3) at fc > +/-30MHz 4. Constellation Error(EVM)@ target power 1) MCS0 2) MCS1 3) MCS2 4) MCS3 5) MCS4 6) MCS5 7) MCS6 8) MCS7 5. Frequency Error RX Characteristics 6. Minimum Input Level Sensitivity(each chain) 1) MCS0 (PER 10%) 2) MCS1 (PER 10%) 3) MCS2 (PER 10%) 4) MCS3 (PER 10%) 5) MCS4 (PER 10%) 6) MCS5 (PER 10%) 7) MCS6 (PER 10%) 8) MCS7 (PER 10%) 7. Maximum Input Level (PER 10%) Min. 12

-10 Min.

-20 14

-33

-35

+2 Typ.

-94

-90

-87

-85

-82

-77

-75

-75

16

-20

-28

-45

-5

-10

-13

-16

-19

-22

-25

-28 10 Max.

-90

-88

-85

-83

-80

-75

-73

-73

dBm dBr dBr dBr dB dB dB dB dB dB dB dB ppm Unit dBm dBm dBm dBm dBm dBm dBm dBm dBm Sichuan AI-Link Technology Co., Ltd. page 10 of 16 3-4 IEEE 802.11a Section:

Items Specification Mode Channel Data rate TX Characteristics 1. Power Levels 1) For Each data rate 2. Spectrum Mask @ target power 1) at fc +/-11MHz 2) at fc +/-20MHz 3) at fc > +/-30MHz 3 Constellation Error(EVM)@ target power 1) 6Mbps 2) 9Mbps 3) 12Mbps 4) 18Mbps 5) 24Mbps 6) 36Mbps 7) 48Mbps 8) 54Mbps 4 Frequency Error RX Characteristics 5 Minimum Input Level Sensitivity(each chain) 1) 6Mbps (PER 10%) 2) 9Mbps (PER 10%) 3) 12Mbps (PER 10%) 4) 18Mbps (PER 10%) 5) 24Mbps (PER 10%) 6) 36Mbps (PER 10%) 7) 48Mbps (PER 10%) 8) 54Mbps (PER 10%) 6 Maximum Input Level (PER 10%) WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module Contents IEEE802.11a OFDM CH36 to CH165 6, 9, 12, 18, 24, 36, 48, 54Mbps Max. Typ. Unit Remark 10 12 Min.

-10 Min.

-20 14

-20

-28

-40

-5

-8

-10

-13

-16

-19

-22

-25 10 Max.

-82

-81

-79

-77

-74

-70

-66

-65

dBm dBr dBr dBr dB dB dB dB dB dB dB dB ppm Unit dBm dBm dBm dBm dBm dBm dBm dBm dBm

-31

-35

+2 Typ.

Sichuan AI-Link Technology Co., Ltd. page 11 of 16 WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module Contents IEEE802.11n HT20 @ 5GHz OFDM CH36 to CH165 MCS0/1/2/3/4/5/6/7 Max. Unit Typ. Remark 3-5 IEEE 802.11n HT20 Section:

Items Specification Mode Channel Data rate (MCS index) TX Characteristics 2. Power Levels 1) For Each antenna port 3. Spectrum Mask @target power 1) at fc +/-11MHz 2) at fc +/-20MHz 3) at fc > +/-30MHz 4. Constellation Error(EVM)@ target power 1) MCS0 2) MCS1 3) MCS2 4) MCS3 5) MCS4 6) MCS5 7) MCS6 8) MCS7 5. Frequency Error RX Characteristics 6. Minimum Input Level Sensitivity(each chain) 1) MCS0 (PER 10%) 2) MCS1 (PER 10%) 3) MCS2 (PER 10%) 4) MCS3 (PER 10%) 5) MCS4 (PER 10%) 6) MCS5 (PER 10%) 7) MCS6 (PER 10%) 8) MCS7 (PER 10%) 7. Maximum Input Level (PER 10%) Min. 10

-10 Min.

-20 12

-33

-35

+2 Typ.

14

-20

-28

-45

-5

-10

-13

-16

-19

-22

-25

-28 10 Max.

-87

-84

-82

-79

-75

-71

-70

-69

dBm dBr dBr dBr dB dB dB dB dB dB dB dB ppm Unit dBm dBm dBm dBm dBm dBm dBm dBm dBm Sichuan AI-Link Technology Co., Ltd. page 12 of 16 4. Refelow Standard Condition WF-M620-RSD2 IEEE 802.11a/b/g/n 1T1R IoT Module 5. Key Materials Item Category MPN Description Notes 1 2 3 IC MT3620AN 165-QFN PCB JUI7.820.0713 FR-4,4LAY Crystal Oscillator

26MHz,2520,11pF 10ppm,-20~75;

32.768KHZ,2012,11p F20ppm,-40~85;

MFR MTK Sunlord IQPCB SHPCB JWT Hosonic TXC TKD Sichuan AI-Link Technology Co., Ltd. page 13 of 16 WF-M620-RSD2 IEEE 802.11b/g/n 1T1R IoT Module 6. External Antenna Specification ITEM Category Part No. External Antenna Dipole Antenna XBLAN2450B-64DBGM-1 7. Product Label&Label Location 8. Conditions of use Please keep the antenna away from metal and horn interference sources. Sichuan AI-Link Technology Co., Ltd. page 14 of 16 WF-M620-RSD2 IEEE 802.11b/g/n 1T1R IoT Module 9. FCC Statement FCC regulatory compliance statement 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. Warning: changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. This Module complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. Labelling Instruction for Host Product Integrator Please notice that if the FCC identification number 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 FCC ID: 2AOKI-WFM620RSD2 any similar wording that expresses the same meaning may be used. Installation Notice to Host Product Manufacturer The OEM integrator is responsible for ensuring that the end-user has no manual instruction to remove or install module. The module is limited to installation in mobile application, a separate approval configurations, including portable configurations with respect to 2.1093 and difference antenna configurations. is required for all other operating Antenna Change Notice to Host manufacturer If you desire to increase antenna gain and either change antenna type or use same antenna type certified, a Class II permissive change application is required to be filed by us, or you (host manufacturer) can take responsibility through the change in FCC ID (new application) procedure followed by a Class II permissive change application. FCC other Parts, Part 15B Compliance Requirements for Host product manufacturer This modular transmitter is only FCC authorized for the specific rule parts listed on our grant, host product manufacturer is responsible for compliance to any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. Host manufacturer in any case shall ensure host product which is installed and operating with the module is in compliant with Part 15B requirements. Note: 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 or more 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. Sichuan AI-Link Technology Co., Ltd. page 15 of 16 WF-M620-RSD2 IEEE 802.11b/g/n 1T1R IoT Module ISED Regulatory Compliance 10. This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canadas licence-exempt RSS(s). Operation is subject to the following two conditions:

(1)This device may not cause interference.(2)This device must accept any interference, including interference that may cause undesired operation of the device. Lmetteur/rcepteur exempt de licence contenu dans le prsent appareil est conforme aux CNR dInnovation, Sciences et Dveloppement conomique Canada applicables aux appareils radio exempts de licence. Lexploitation est autorise aux deux conditions suivantes :(1)Lappareil ne doit pas produire de brouillage; (2)Lappareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible den compromettre le fonctionnement. This equipment complies with IC RSS-102 radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body. Cet quipement est conforme aux limites d'exposition aux radiations IC CNR-102 tablies pour un environnement non contrl. Cet quipement doit tre install et utilis avec une distance minimale de 20cm entre le radiateur et votre corps. Please notice that if the IC identification number 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 IC: 23460-WFM620RSD2 any similar wording that expresses the same meaning may be used. Ltiquette dhomologation dun module dInnovation, Sciences et Dveloppement conomique Canada devra tre pose sur le produit hte un endroit bien en vue, en tout temps. En labsence dtiquette, le produit hte doit porter une tiquette sur laquelle figure le numro dhomologation du module dInnovation, Sciences et Dveloppement conomique Canada, prcd du mot contient , ou dune formulation similaire allant dans le mme sens et qui va comme suit : Contient IC:

23460-WFM620RSD2 est le numro dhomologation du module. i. the device for operation in the band 51505250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems;

ii. for devices with detachable antenna(s), the maximum antenna gain permitted for devices in the bands 5250-5350 MHz and 5470-5725 MHz shall be such that the equipment still complies with the e.i.r.p. limit;

iii. for devices with detachable antenna(s), the maximum antenna gain permitted for devices in the band 5725-5850 MHz shall be such that the equipment still complies with the e.i.r.p. limits as appropriate; and i. le dispositif utilis dans la bande 5150-5250 MHz est rserv une utilisation en intrieur afin de rduire le risque de brouillage prjudiciable aux systmes mobiles par satellite dans le mme canal;

ii. pour les dispositifs antenne (s) dtachable (s), le gain d'antenne maximal autoris pour les dispositifs dans les bandes 5250-5350 MHz et 5470-5725 MHz doit tre tel que l'quipement soit toujours conforme la norme e.i.r.p. limite;

cas chant; et pour les dispositifs antenne (s) dtachable (s), le gain d'antenne maximal autoris pour les dispositifs de la bande 5725-5850 MHz doit tre tel que l'quipement soit toujours conforme la norme e.i.r.p. les limites, le Sichuan AI-Link Technology Co., Ltd. page 16 of 16

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Sichuan AI-Link Technology Co.,Ltd. Authority to Act as Agent Date: May 31, 2021 American Certification Body, Inc. 6731 Whittier Avenue Suite C110 McLean, VA 22101 To Whom It May Concern:

Intertek Testing Services Shanghai 1 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: _____2022/05/30_____ By:

Title:

On behalf of: ___ Sichuan AI-Link Technology Co.,Ltd__________ Telephone:

______ HU CAIXIA______________

(Print name) __________________________ ______+86-0816-2438701 _________________ ________ Director ______________

(Company Name)

(Signature2) 1 - If a group entity is designated as the authorized agent, the letter of authorization must identify those individuals within the group who are authorized to take action on the application; or alternatively a statement must be provided indicating that as the authorized agent, any individual within the group entity is authorized to act on behalf of the applicant / grantee and take action on the application. See https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=33316 . 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. 041521-14

Sichuan AI-Link Technology Co.,Ltd. Request for Confidentiality Date: June 11, 2021 Subject: Confidentiality Request for: ______FCC ID: 2AOKI-WFM620RSD2 ______ 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 ______Sichuan AI-Link Technology Co.,Ltd._____ 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:

The applicant requests the exhibits selected above as short term confidential be withheld from public view for a period of ___(specify number of days not to exceed 180)2___ 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. NOTE for Industry Canada Applications:

IC currently only distinguishes Permanent Confidentiality exhibits as shown above. Short Term confidentiality is not considered applicable to IC applications. Sincerely, By:

______ HU CAIXIA______________ __________________________

(Signature/Title3)

(Print name) 1 - The asterisked items (*) require further information to be provided to ACB before permanent confidentiality will be extended 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 - Please refer to https://acbcert.com/documents/misc-docs/Memo-Short-Term-Vs-Standard-Confidentiality.pdf for complete details. 3 - 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. 041521-14

Sichuan AI-Link Technology Co.,Ltd. Request for Modular/Limited Modular Approval Date: May 31, 2021 Subject: Manufacturers Declaration for - Modular Approval Confidentiality Request for: ______FCC ID: 2AOKI-WFM620RSD2 ______

- Limited Modular Approval - Limited Split Modular Approval

- Split Modular Approval 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) 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.

- YES - NO(*) 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) Details: Data to the modulation circuit is buffered as described in the operational description provided with the application.

- YES - NO(*) 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) Details: The module contains its own power supply regulation. Please refer to schematic filed with this application.

- YES - NO(*) 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) Details: The module connects to permanently attached antenna. 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) Details: The module was tested stand-alone as shown in test setup photographs filed with this application.

- YES - NO(*)

- YES - NO(*) 070920-02b Sichuan AI-Link Technology Co.,Ltd. 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) 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.

- YES - NO(*) 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 15C requirements. Instructions to the OEM installer are provided in the installation manual filed with this application.

- YES - NO(*) 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 meets Portable exclusion levels as shown in the RF exposure information filed with this application.

- YES - NO(*) 070920-02b Sichuan AI-Link Technology Co.,Ltd. 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: <example - 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: The firmware of the device can not be modified or adjusted by the end user as described in operation description. 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: <example 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. Details: <example N/A >

- Provided in Separate Cover Letter

- N/A 070920-02b Sichuan AI-Link Technology Co.,Ltd. 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:

070920-02b __________________________

(Signature/Title1) ______ HU CAIXIA _____

(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 appropriate letterhead.

Sichuan AI-Link Technology Co.,Ltd. Declaration Letter We Sichuan AI-Link Technology Co.,Ltd. hereby declare that the product WIFI Module/WF-M620-RSD2 is capable of operating with channel 12 and 13 in regions other than the US and Canada. Versions of the product available for import and sale in the US and Canada, or any units marked with the FCC ID or IC certification number, will not operation on channels 12 and 13. It will not be possible for users and configure these channels in the US and Canada version. Installation of this product must comply with local regulations and codes. During deployment of the system and its initial setup, professional installer must ensure that the allowed EIRP limit is not exceeded (in the Country of exploitation of this equipment). Date: May 30, 2021

HU CAIXIA Sichuan AI-Link Technology Co., Ltd. Tel: +86-0816-2438701 Email: caixia.hu@changhong.com