2BB8U-WS8475Wireless Transceiver Module

WS8475 LoRaUartModule DataSheet Support850-930MHzfrequencyband. Supporttransparenttransmission,fixed-pointtransmission,broadcasttransmission,channelmonitoringandother functions. Supportdeepsleep,inwhichthepowerconsumptionofthewholemachineislessthan2UA;  Supportmulti-leveldatatransmissionrateof2.4k～62.5kbps  Supportsmultiplelevelsofbaudratefrom1200bpsto256000bps.  Themaximumsupportedpacketlengthis246bytes. Supportrandomencryptionofdataintheair  SupportLBTfunction Supportrelayfunction SupportpacketRSSIandchanneldetectionRSSI Support1Kdatacache. Themodulesupports81channels. Support3.0～5.5Vpowersupply,andpowersupplygreaterthan3.5Vcanensurethebestperformance. Industrialstandarddesign,supportinglong-termuseat-40~+85°C Dualantennasareoptional(IPEX/stamphole)forintegration. SilentSmartTechnologyCo.,Ltd. 2/35 Documentinformation productmodelWS8475 ProductoverviewUartModule DocumenttypeDatasheet Documentnumber DocumentversionV3.02025.06.18 Documentversionupdate serial number version number RevisedcontentRevisiondateReviser onev1.0Initialversion2024.12.17SQ 2v2.0AdjustRF-relatedconfigurationparameters2025.02.12SQ threev2.1Modifyparameterdescription2025.03.26SQ fourv2.2Modifythedefaultparameterdescriptionandsendthe datasequencediagram. 2025.04.19SQ fivev3.0AddATcommandconfigurationandmodifyhardware parameters. 2025.06.18SQ/LP SilentSmartTechnologyCo.,Ltd. 3/35 catalogue WS8475..........................................................................................................................................................................................................1 1productoverview.......................................................................................................................................................................................5 1.1Productintroduction.......................................................................................................................................................................5 1.2Featuresandfunctions...................................................................................................................................................................5 1.3Applicationscenarios.....................................................................................................................................................................5 2-pindefinition.............................................................................................................................................................................................6 3Hardwaredesign.......................................................................................................................................................................................7 4functiondescription...................................................................................................................................................................................7 4.1ModeDescription...........................................................................................................................................................................7 4.1.1TransmissionMode(Mode0).............................................................................................................................................8 4.1.1.1transparenttransmissionfunction............................................................................................................................8 4.1.1.2BroadcastingandMonitoringFunctions..................................................................................................................9 4.1.1.3fixed-pointtransmissionfunction............................................................................................................................9 4.1.1.4relaytransmissionfunction......................................................................................................................................9 4.1.1.5ATconfigurationfunction......................................................................................................................................10 4.1.2WORmode(modes1and2).............................................................................................................................................10 4.1.3Configuration,SleepMode(Mode3)...............................................................................................................................10 4.1.3.1sleepmode..............................................................................................................................................................11 4.1.3.2parameterconfiguration.........................................................................................................................................11 4.1.3.2.1Configurationandconfigurationinsleepmode..........................................................................................11 4.1.3.2.2Configurationintransmissionmode...........................................................................................................11 4.2Modulestatusindication..............................................................................................................................................................11 4.2.1receivingdataAUXstatusindication................................................................................................................................12 4.2.2SenddataAUXstatusindication......................................................................................................................................12 4.2.3Power-onAUXstatusindication.......................................................................................................................................12 4.2.4ATcommandresetsAUXstatusindication.......................................................................................................................13 4.3Restore…

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Page 1 of 3 Report No.: LGT26E104 Appendix - External Photographs of EUT Constructional Details Photo 1 Photo 2 Page 2 of 3 Report No.: LGT26E104 Appendix - External Photographs of EUT Constructional Details Photo 3 Photo 4 Page 3 of 3 Report No.: LGT26E104 Appendix - External Photographs of EUT Constructional Details Photo 5 Photo 6

Page 1 of 1 Report No.: LGT26E104 Appendix - Internal Photographs of EUT Constructional Details Photo 1 Photo 2

The test report is effective only with both signature and specialized stamp. This report shall not be reproduced except in full without the written approval of the Laboratory. The results in this report only apply to the tested sample. Shenzhen LGT Test Service Co., Ltd. Tel: 0755-89668180 E-mail:[email protected] Web: www.lgt-cert.com Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Page 1 of 8 EMF TEST REPORT Product Name: Wireless Transceiver Module Model Number: WS8475 FCC ID: 2BB8U-WS8475 Issued For : Chengdu Silent Smart Technology Co., Ltd. 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Issued By : Shenzhen LGT Test Service Co., Ltd. Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Report Number: LGT26E104HA02 Sample Received Date: May 18, 2026 Date of Test: May 18, 2026 ~ May 29, 2026 Date of Issue: May 29, 2026 Report No.: LGT26E104HA02 Page 2 of 8 TEST REPORT CERTIFICATION Applicant: Chengdu Silent Smart Technology Co., Ltd. Address: 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Manufacturer: Chengdu Silent Smart Technology Co., Ltd. Address: 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Product Name: Wireless Transceiver Module Trademark: Silent Smart Model Number: WS8475 Sample Status: Normal APPLICABLE STANDARDS STANDARD TEST RESULTS FCC 47 CFR §2.1091 KDB 447498 D01 General RF Exposure Guidance v06 PASS Prepared by: Approved by: Zane Shan Vita Li Engineer Technical Director Report No.: LGT26E104HA02 Page 3 of 8 TABLE OF CONTENTS 1 . GENERAL INFORMATION 5 1.1 GENERAL DESCRIPTION OF THE EUT 5 1.2 TEST LABORATORY 5 2 . FCC 47CFR §2.1091 REQUIREMENT 6 2.1 TEST STANDARDS 6 2.2 LIMIT 6 2.3 EUT OPERATION CONDITION 7 2.4 CLASSIFICATION 7 2.5 TEST RESULT 8 Report No.: LGT26E104HA02 Page 4 of 8 Revision History Rev. Issue Date Revisions 00 May 29, 2026 Initial Issue Report No.: LGT26E104HA02 Page 5 of 8 1. GENERAL INFORMATION 1.1 GENERAL DESCRIPTION OF THE EUT Product Name: Wireless Transceiver Module Test Model Number: WS8475 Series Number: N/A Model Difference: N/A Frequency Bands: LORA 902.75-926.75 MHz Rating: Input: DC 3.0~5.5V 300mA Hardware Version: V1.0 Software Version: V1.0 1.2 TEST LABORATORY Company Name: Shenzhen LGT Test Service Co., Ltd. Address: Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Accreditation Certificate: FCC Registration No.: 746540 CAB ID: CN0136 Report No.: LGT26E104HA02 Page 6 of 8 2. FCC 47CFR §2.1091 REQUIREMENT 2.1 TEST STANDARDS The limit for Maximum Permissible Exposure (MPE) specified in FCC 1.1310 is followed. The gain of the antennas used in the product is extracted from the Antenna data sheets provided and also the maximum total power input to the antenna is measured. Through the Friis transmission formula and the maximum gain of the antenna, we can calculate the distance, away from the product, where the limit of MPE is reached. Although the Friis Transmission formula is far field assumption, the calculated result of that is an over-prediction for near field power density. It is taken as worst case to specify the safety range. 2.2 LIMIT According to FCC 1.1310: The criteria listed in the following table shall be used to evaluate the environmental impact of the human exposure to radio-frequency (RF) radiation as specified in 1.1307 (b) Limits for Maximum Permissible Exposure (MPE) Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm²) Limits for Occupational / controlled Exposures 0.3-3.0 614 1.63 *(100) 3.0-30 1842/f 4.89/f *(900/f 2 ) 30-300 61.4 0.163 1.0 300 - 1500 -- -- F/300 1500 – 100000 -- -- 5.0 Limits for General population / Uncontrolled Exposure 0.3-1.34 614 1.63 *(100) 1.34-30 824/f 2.19/f *(180/f 2 ) 30-300 27.5 0.073 0.2 300 - 1500 -- -- F/1500 1500 – 100000 -- -- 1.0 F= Frequency in MHz * = Plane-wave equivalent power density. Friss Formula Friss Transmission Formula: Pd = (Pout * G) / (4*pi*r²) Where Pd = power density in mW/cm² Pout = output power to antenna in mW G = gain of antenna in linear scale Pi = 3.1416 R = Distance between observation point and the center of radiator in cm If we know the maximum gain of the antenna and the total output power to the antenna, through calculation, we will know MPE value at distance 20cm. Report No.: LGT26E104HA02 Page 7 of 8 2.3 EUT OPERATION CONDITION EUT was enabled to transmit and receive at lowest, middle and highest channels. 2.4 CLASSIFICATION The antenna of this product, under normal use condition, is at least 20cm away from the body of the user. Warning statement to the user for keeping at least 20cm or more separation distance from the antenna should be included in the User manual. So, this device is classified as Mobile device. Report No.: LGT26E104HA02 Page 8 of 8 2.5 TEST RESULT Turn up Result Mode Turn up Power 902-928MHz 12.5±1dBm The MPE result of worst mode: RF Function Max Turn up Power (dBm) Max Turn up Power (mW) ANT Gain (dBi) ANT Gain (gain of antenna in linear scale) Power Density (mW/cm²) Limit (mW/cm²) Ratio Result 902-928MHz 13.50 22.39 -0.08 0.98 0.004 0.6018333 0.007 Pass Note: 1. The RF Exposure is less than the limit, complies with the exemption requirements. ※※※※※END OF THE REPORT※※※※※

ShenZhenXinErShengTechnologyCo.,Ltd CustomerName: Recognition ProductName: 850-930MHZFoldableantennaL=50MM( ± 5mm) CustomerCode: Manufacturer Code:ANT850-930JK05 Quantity:2PCS produceauditsauthorizeSampledelivery date BiaoLisenAmy2023.06.02 CustomerRecognition: recognitionauditsauthorizeDate Recognitionstatus:☑NewProducts□Recognitionofprojects Acknowledgementofitems:□Letterofacknowledgementintriplicate □Sample5PCS Acknowledgementofconclusions：□Accept□Rejected Address ： 3/F,BuildingD,No.96LingxiaRoad,FenghuangFourthIndustrialZone, Fuyong,Bao'anDistrict,Shenzhen,China. Tel：0755-33881455Fax:0755-33233276 Email:[email protected] ShenZhen XinErSheng Technology Co.,Ltd Main Technical Parameters 主要技术参数 Main technical specifications 频率范围（MHz） 850-930 Frequency Range(MHZ) 850-930 中心频率 特性阻抗(Ω) 50±10 Impedance(Ω) 50±10 增益(dBi) -0.08 Gain (dBi) -0.08 反射损耗≤-10 ReTurnLoss(dB) ≤-10 输出电压驻波比≤2 VSWR ≤2 极化方式垂直极化 PolarizationLinear Vertical 物理特性 Physical Properties 天线本体材料 TPEE Antenna BaseTPEE 工作温度 -40°C-+85°C Operating Temp -40°C-+85°C 保存温度 -40°C-+85°C Storage Temp -40°C-+85°C 天线类型 Dipole Antenna Antenna Type Dipole Antenna ShenZhenXinErShengTechnologyCo.,Ltd ProductDrawings ShenZhenXinErShengTechnologyCo.,Ltd MainTechnicalParameters 1.standingwaveratio(physics) 2.Smith'scirclediagram ShenZhenXinErShengTechnologyCo.,Ltd 2D,3DRaditationPattern Total(E1-XZ)

The test report is effective only with both signature and specialized stamp. This report shall not be reproduced except in full without the written approval of the Laboratory. The results in this report only apply to the tested sample. Shenzhen LGT Test Service Co., Ltd. Tel: 0755-89668180 E-mail:[email protected] Web: www.lgt-cert.com Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Page 1 of 43 RF TEST REPORT Product Name: Wireless Transceiver Module Model Number: WS8475 FCC ID: 2BB8U-WS8475 Issued For : Chengdu Silent Smart Technology Co., Ltd. 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Issued By : Shenzhen LGT Test Service Co., Ltd. Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Report Number: LGT26E104RF02 Sample Received Date: May 18, 2026 Date of Test: May 18, 2026 ~ May 29, 2026 Date of Issue: May 29, 2026 Report No.: LGT26E104RF02 Page 2 of 43 TEST REPORT CERTIFICATION Applicant: Chengdu Silent Smart Technology Co., Ltd. Address: 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Manufacturer: Chengdu Silent Smart Technology Co., Ltd. Address: 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Product Name: Wireless Transceiver Module Trademark: Silent Smart Model Number: WS8475 Sample Status: Normal APPLICABLE STANDARDS STANDARD TEST RESULTS FCC Part 15.247, Subpart C ANSI C63.10-2020 + COR.1-2023 PASS Prepared by: Approved by: Chris Chen Vita Li Engineer Technical Director Report No.: LGT26E104RF02 Page 3 of 43 Table of Contents Page 1. SUMMARY OF TEST RESULTS 6 1.1 TEST LABORATORY 7 1.2 MEASUREMENT UNCERTAINTY 7 2. GENERAL INFORMATION 8 2.1 GENERAL DESCRIPTION OF THE EUT 8 2.2 DESCRIPTION OF THE TEST MODES 9 2.3 TEST SOFTWARE AND POWER LEVEL 9 2.4 DESCRIPTION OF NECESSARY ACCESSORIES AND SUPPORT UNITS 10 2.5 EQUIPMENTS LIST 11 3. EMC EMISSION TEST 13 3.1 CONDUCTED EMISSION MEASUREMENT 13 3.2 TEST PROCEDURE 14 3.3 TEST SETUP 14 3.4 EUT OPERATING CONDITIONS 14 3.5 TEST RESULTS 15 4. RADIATED EMISSION MEASUREMENT 17 4.1 RADIATED EMISSION LIMITS 17 4.2 TEST PROCEDURE 19 4.3 TEST SETUP 19 4.4 EUT OPERATING CONDITIONS 20 4.5 FIELD STRENGTH CALCULATION 20 5. CONDUCTED SPURIOUS & BAND EDGE EMISSION 25 5.1 LIMIT 25 5.2 TEST PROCEDURE 25 5.3 TEST SETUP 25 5.4 EUT OPERATION CONDITIONS 25 5.5 TEST RESULTS 25 6. POWER SPECTRAL DENSITY TEST 26 6.1 LIMIT 26 6.2 TEST PROCEDURE 26 6.3 TEST SETUP 26 6.4 EUT OPERATION CONDITIONS 26 6.5 TEST RESULTS 26 Report No.: LGT26E104RF02 Page 4 of 43 7. BANDWIDTH TEST 27 7.1 LIMIT 27 7.2 TEST PROCEDURE 27 7.3 TEST SETUP 27 7.4 EUT OPERATION CONDITIONS 27 7.5 TEST RESULTS 27 8. PEAK OUTPUT POWER TEST 28 8.1 LIMIT 28 8.2 TEST PROCEDURE 28 8.3 TEST SETUP 28 8.4 EUT OPERATION CONDITIONS 28 8.5 TEST RESULTS 28 9. ANTENNA REQUIREMENT 29 9.1 STANDARD REQUIREMENT 29 9.2 EUT ANTENNA 29 APPENDIX I - TEST RESULTS 30 1. DUTY CYCLE 30 2. BANDWIDTH 32 3. MAXIMUM CONDUCTED OUTPUT POWER 35 4. MAXIMUM POWER SPECTRAL DENSITY 37 5. UNWANTED EMISSIONS IN NON-RESTRICTED FREQUENCY BANDS 39 APPENDIX II - MEASUREMENT PHOTOS 43 Report No.: LGT26E104RF02 Page 5 of 43 Revision History Rev. Issue Date Revisions 00 May 29, 2026 Initial Issue Report No.: LGT26E104RF02 Page 6 of 43 1. SUMMARY OF TEST RESULTS Test procedures according to the technical standards: KDB 558074 D01 Part 15.247 Meas Guidance v05r02. FCC Part 15.247, Subpart C Standard Section Test Item Judgment Remark 15.207 Conducted Emission PASS -- 15.247 (a)(2) 6dB Bandwidth PASS -- 15.247 (b)(3) Output Power PASS -- 15.209 Radiated Spurious Emission PASS -- 15.247 (d) Conducted Spurious & Band Edge Emission PASS -- 15.247 (e) Power Spectral Density PASS -- 15.205 Restricted Band Edge Emission PASS -- Part 15.247(d)/ Part 15.209(a) Band Edge Emission PASS -- 15.203 Antenna Requirement PASS -- NOTE: (1) ‘N/A’ denotes test is not applicable in this Test Report. (2) All tests are according to ANSI C63.10-2020 + COR.1-2023. Report No.: LGT26E104RF02 Page 7 of 43 1.1 TEST LABORATORY Company Name: Shenzhen LGT Test Service Co., Ltd. Address: Room 205, Building 13, Zone B, Zhenxiong Industrial Park, No.177, Renmin West Road, Jinsha, Kengzi Street, Pingshan District, Shenzhen, Guangdong, China Accreditation Certificate: FCC Registration No.: 746540 CAB ID: CN0136 1.2 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2, providing a level of confidence of approximately 95 %. No. Item Uncertainty 1 Occupied Channel Bandwidth ±0.46% 2 RF Output Power, Conducted ±0.71dB 3 Power Spectral Density, Conducted ±1.57dB 4 Unwanted Emission, Conducted ±0.63dB 5 Conducted emission ±2.80dB 6 All Emissions, Radiated (0.009-30MHz) ±2.16dB 7 All Emissions, Radiated (30MHz-1GHz) ±4.61dB 8 All Emissions, Radiated (1GHz-18GHz) ±5.49dB 9 Temperature ±0.5°C 10 Humidity ±2% 11 Duty Cycle ±2.3% Note: The measurement uncertainty is not included in the test result. Report No.: LGT26E104RF02 Page 8 of 43 2. GENERAL INFORMATION 2.1 GENERAL DESCRIPTION OF THE EUT Product Name: Wireless Transceiver Module Test Model Number: WS8475 Series Number: N/A Model Difference: N/A Product Description: Operation Frequency: 902.75-926.75 MHz Modulation Type: LORA Number Of Channel: 25CH Antenna Designation: Dipole Antenna Antenna Gain (dBi) -0.08dBi Channel List: Please refer to the Note 3. Rating: Input: DC 3.0~5.5V 300mA Hardware Version: V1.0 Software Version: V1.0 Connecting I/O Port(s): Please refer to the Note 1. Note: 1. For a more detailed features description, please refer to the manufacturer’s specifications or the User Manual. 2. The antenna information r…

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Page 1 of 2 Report No.: LGT26E104 Appendix - Test Setup photos Set-up for Radiated Spurious Emission, Below 1GHz Set-up for Radiated Spurious Emission, Above 1GHz Page 2 of 2 Report No.: LGT26E104 Set-up for Conducted Emission