2BB8U-WS8854FLSWireless Transceiver Module

Attestation Statements (July 2, 2024) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA RE: Attestation Statements Part 2.911(d)(7) request for (FCC ID: 2BB8U-WS8854FLS ) (Chengdu Silent Smart Technology Co., Ltd.), the undersigned, hereby authorize (NEWENERGYER LIMITED) to act as our designated U.S. agent for service of process, (Chengdu Silent Smart Technology Co., Ltd.) accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. (NEWENERGYER LIMITED) accepts the responsibility to act as designated U.S. agent for service of process, provides an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Applicant Information： Company name: Chengdu Silent Smart Technology Co., Ltd. Contact Name: Sheng Liguo Address: 303-7, Floor 3, Building 12, No.38, South Jinke Road, Jinniu Hi-tech Industrial Park, Chengdu, Sichuan, China Telephone No: 13538214502 Email: [email protected] FRN: 0034052233 Signature [Sheng Liguo] U.S. Agent Information: Company Name: NEWENERGYER LIMITED Address: 1818 S Patton Ct, Denver, CO, 80219 Contact Name: CHUN LIU Telephone No: 213 289 5042 Email: [email protected] FRN: 0034665885 Signature [CHUN LIU]

(Chengdu Silent Smart Technology Co., Ltd.) (July 2, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(i) request for (FCC ID: 2BB8U-WS8854FLS) [Chengdu Silent Smart Technology Co., Ltd.] (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Sincerely, (Applicant signature) (Applicant printed name) Sheng Liguo (Chengdu Silent Smart Technology Co., Ltd.) (July 2, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Attestation Statements Part 2.911(d)(5)(ii) request for (FCC ID: 2BB8U-WS8854FLS) [Chengdu Silent Smart Technology Co., Ltd.] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Sheng Liguo

< Chengdu Silent Smart Technology Co., Ltd.> Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 Company name: Chengdu Silent Smart Technology Co., Ltd. FCC ID: 2BB8U-WS8854FLS Gentlemen, In accordance with 47CFR 15.212 Modular Transmitters and KDB 996369 D01 ‘Module Certification Guide v02’. FCC ID: 2BB8U-WS8854FLS has been examined against the following requirements. Items to be covered by Single modular transmitters. Requirement per 15.212 and KDB 996369 D01 ‘Modular Certification Guide v02 Explanation from Grantee 1. The radio elements must have the radio frequency circuitry shielded. Physical components and tuning capacitor(s) may be located external to the shield, but must be on the module assembly YES 2. The module must have buffered modulation/data inputs to ensure that the device will comply with Part 15 requirements with any type of input signal YES 3. The module must contain power supply regulation on the module YES 4. The module must contain a permanently attached antenna, or contain a unique antenna connector, and be marketed and operated only with specific antenna(s), per Sections 15.203, 15.204(b), 15.204(c), 15.212(a), 2.929(b) YES 5. The module must demonstrate compliance in a stand- alone configuration YES 6. The module must be labelled with its permanently affixed FCC ID label, or use an electronic display (See KDB Publication 784748 about labelling requirements) YES 7. The module must comply with all specific rules applicable to the transmitter including all the conditions provided in the integration instructions by the grantee YES 8. The module must comply with RF exposure requirements YES Name: Sheng Liguo Title: Manager Signature of applicant Date: 2024.07.02

Chengdu Silent Smart Technology Co., Ltd. (July 2, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Wireless Transceiver Module / WS8854FLS / FCC ID: 2BB8U-WS8854FLS) To Whom It May Concern: This letter serves as an official request for confidentiality under sections 0.457 and 0.459 of CFR 47. We have requested that the Exhibits Long-Term Confidentiality Short-Term Confidentiality NOTE 2 ID Label/Location No No Attestation Statement No No External Photos No ☐ Block Diagram ☒ ☐ Schematics ☒ ☐ Test Report No No Test Setup Photos No ☐ User’s Manual ☐ NOTE 1 ☒ Internal Photos ☐ NOTE 1 ☒ Parts List / Tune Up ☐ ☐ RF Exposure Info No No Operational Description ☒ ☐ Cover Letter(s) No No SDR Software / Security Info ☐ No required to be submitted with this application be permanently withheld from public review. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Signature: Name: Sheng Liguo Title: Manager

Chengdu Silent Smart Technology Co., Ltd. (July 2, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize (Shenzhen CTB Testing Technology Co., Ltd.) to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). This agreement expires one year from the current date. Sincerely, Signature: Name: Sheng Liguo Title: Manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 4 Model: WS8854FLS External Photos ANT Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 4

FCC ID LABEL: Label Location:

FCC §15.247 (i), §2.1091 – RF Exposure FCC ID: 2BB8U-WS8854FLS Applied procedures / limit According to FCC §15.247(i) and §1.1307(b)(1), systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. Limits for Occupational / Controlled Exposure Frequency Range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/ cm 2 ) Averaging Time |E| 2 ,|H| 2 or S (minutes) 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842 / f 4.89 / f (900 / f)* 6 30-300 61.4 0.163 1.0 6 300-1500 F/300 6 1500-100,000 5 6 Note: ƒ is frequency in MHz * = Power density limit is applicable at frequencies greater than 100 MHz Limits for General Population / Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/ cm 2 ) Averaging Time |E| 2 ,|H| 2 or S (minutes) 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 F/1500 30 1500-100,000 1.0 30 Note: f = frequency in MHz * = Plane-wave equivalent power density MPE PREDICTION Predication of MPE limit at a given distance, Equation from OET Bulletin 65, Edition 97-01 Where: S = power density P = power input to antenna G = power gain of the antenna in the direction of interest relative to an isotropic radiator R = distance to the center of radiation of the antenna,R=20cm Test Result of RF Exposure Evaluation Modes& Channel Freq. (MHz) Tune up Produce power Maximu m peak output power (dBm) Output power to antenna (mW) Antenna Gain (numeric) Power Density (S) (mW/ cm2) Limit (mW / cm2 ) Result SRD LCH 14±1 15 31.6228 1 (0dBi) 0.00629 0.6 Pass

ShenZhen XinErSheng Technology Co.,Ltd Customer Name: Recognition Product Name : 915MHZ One-piece antenna L=70MM (3-45mm) Customer Code : Manufacturer Code : SFANT11A13531 Quantity : 5PCS produce audits authorize Sample delivery date Biao Lisen Amy 2023.06.02 Customer Recognition: recognition audits authorize Date Recognition status: ☑ New Products □ Recognition of projects Acknowledgement of items: □ Letter of acknowledgement in triplicate □ Sample 5PCS Acknowledgement of conclusions：□ Accept □ Rejected Address：3/F, Building D, N o . 96 Lingxia Road, Fenghuang Fourth Industrial Zone, Fuyong, Bao'an District, Shenzhen, China. Tel：0755-33881455 Fax: 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） 868-915 Frequency Range(MHZ) 868-915 中心频率 50±10 Impedance(Ω) 50±10 特性阻抗(Ω) 增益(dBi) 0 Gain (dBi) 0 反射损耗 ≤-10 ReTurnLoss(dB) ≤-10 输出电压驻波比 ≤3 VSWR ≤3 极化方式 垂直极化 Polarization Linear Vertical 连接方式 IPEX Connector Type IPEX 物理特性 Physical Properties 天线本体材料 ABS Antenna Base ABS 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 ShenZhen XinErSheng Technology Co.,Ltd Product Drawings ShenZhen XinErSheng Technology Co.,Ltd Main Technical Parameters 1. standing wave ratio (physics) 2. return loss ShenZhen XinErSheng Technology Co.,Ltd 2D, 3D Raditation Pattern Total (E1-XZ) Total (H-XY) ShenZhen XinErSheng Technology Co.,Ltd photograph of sth.

TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Not e: If there is any objection to the inspection results in this report, please submit a written report to the company within 15 days from the date of receiving the report. The test report is effective only with both signature and specialized stamp. This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen CTB Testing Technology Co., Ltd. this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. “*” indicates the testing items were fulfilled by subcontracted lab. “#” indicates the items are not in CNAS accreditation scope. Product Name: Wireless Transceiver Module FCC ID: 2BB8U-WS8854FLS Trademark: Silent Smart Model Number: WS8854FLS Prepared For: 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, Floor3, Building12, No.38,SouthJinkeRoad,Jinniu Hi-techIndustrialPark, Chengdu, Sichuan, China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F.,BuildingA,No.26, Xinhe Road, Xinqiao,XinqiaoStreet,Bao'anDistrict, Shenzhen,Guangdong,China Sample Received Date: May. 20, 2024 Sample tested Date: May. 20, 2024toJun. 07, 2024 Issue Date: Jun. 07, 2024 Report No.: CTB240607044RF Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2013 Test Results PASS Remark: This isSRDradio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB240607044RF Report Tel: 4008-258-120 Web: http://www.ctb-lab.com Page 2 of 39 TABLE OF CONTENT Test Report Declaration Page 1. VERSION .......................................................................... 4 2. TEST SUMMARY ................................................................... 5 3. MEASUREMENT UNCERTAINTY ..................................................... 6 4. PRODUCT INFORMATION AND TEST SETUP .......................................... 7 4.1 Product Information .................................................................... 7 4.2 Test Setup Configuration ............................................................... 7 4.3 Support Equipment .................................................................... 7 4.4 Channel List .......................................................................... 8 4.5 Test Mode ............................................................................ 9 4.6 Test Environment ...................................................................... 9 5. TEST FACILITY AND TEST INSTRUMENT USED ...................................... 10 5.1 Test Facility .......................................................................... 10 5.2 Test Instrument Used ................................................................. 10 6. AC POWER LINE CONDUCTED EMISSION ............................................ 12 6.1 Block Diagram Of Test Setup .......................................................... 12 6.2 Limit ................................................................................ 12 6.3 Test procedure ....................................................................... 12 6.4 Test Result .......................................................................... 13 7. RADIATED SPURIOUS EMISSION ................................................... 15 7.1 Block Diagram Of Test Setup .......................................................... 15 7.2 Limit ................................................................................ 15 7.3 Test procedure ....................................................................... 16 7.4 Test Result .......................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 22 8.1 Block Diagram Of Test Setup .......................................................... 22 8.2 Limit ................................................................................ 22 8.3 Test procedure ....................................................................... 22 8.4 Test Result .......................................................................... 23 9. COUDUCTED PEAK OUTPUT POWER ............................................... 26 9.1 Block Diagram Of Test Setup .......................................................... 26 9.2 Limit ................................................................................ 26 9.3 Test procedure ....................................................................... 26 9.4 Test Result .......................................................................... 27 10. 20DB OCCUPIED BANDWIDTH...................................................... 29 10.1 Block Diagram Of Test Setup ......................................................... 29 10.2 Limit ............................................................................... 29 10.3 Test procedure ...................................................................... 29 10.4 Test Result ......................................................................... 29 11. CARRIERFREQUENCIES SEPARATION .............................................. 31 11.1 Block Diagram Of Test Setup ......................................................... 31 11.2 Limit ............................................................................... 31 11.3 Test procedure ...................................................................... 31 11.4 Test Result ......................................................................... 31 12. HOPPING CHANNEL NUMBER ...................................................... 33 12.1 Block Diagram Of Test Setup ......................................................... 33 12.2 Limit ................................................................…

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Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 2 Model: WS8854FLS Radiated Emission Below 1G Above 1G Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 2 Conducted emissions