2BTC8-RF-DS91-BTsmart door lock

* theapplicantmustdesignateacontactlocatedintheUnitedStatesforpurposesofactingasthe applicant’sagentforserviceofprocess,regardlessofwhethertheapplicantisadomesticorforeign entity.AnapplicantlocatedintheUnitedStatesmaydesignateitselfastheagentforserviceofprocess. SC6070601 U.S.AgentDesignationforServiceofProcess- CertificationAttestationLetter 8/5/2026 TO:FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 ATTN.:ReviewingEngineer FCCID:2BTC8-RF-DS91-BT FRNofapplicant:0037684305 Persection2.911(d)(7)oftheFCCrules,ShenzhenRongfuTianchengIndustrialCo.,Ltd. FRN:0037684305(“theapplicant”)certifiesthattheequipmentforwhichauthorizationissought isdesignatedtothefollowingU.S.agent*forserviceofprocess: CompanyName:GlobalProductServicesandConsultationLLC FCCRegistrationNumber(FRN):0033406703 PhysicalU.S.CompanyAddress:328WPalmAve.Monrovia,CA91016 ContactPerson:MichaelChan Tel:+16263664358 AgentEmailAddress:[email protected] Theabovecontactpersonacceptstheobligationforserviceofprocess. Theapplicantacceptstomaintainanagentfornolessthanoneyearafterthegranteehas terminatedallmarketingandimportationortheconclusionofanyCommission-related proceedinginvolvingtheequipment. ApplicantSigned:AgentSigned(ifdifferentfromApplicant): Signed: Printedname:WenchaoYang Title:Manager CompanyName:ShenzhenRongfuTiancheng IndustrialCo.,Ltd. Date:8/5/2026 Signed: Printedname:MichaelChan Title:TechnicalDirector CompanyName:GlobalProductServicesand ConsultationLLC Date:8/5/2026

External Photographs View of EUT-1 View of EUT-2 Page 2 of 4 View of EUT-3 View of EUT-4 Page 3 of 4 View of EUT-5 View of EUT-6 Page 4 of 4 View of EUT-7

Product name ： s mart door lock Model No：RF-DS91 Input：DC 5V,500mA FCC ID:2BTC8-RF-DS91-BT MadeinChina Shenzhen Rongfu Tiancheng Industrial Co., Ltd

Internal Photographs Internal View of EUT-1 Internal View of EUT-2 Page 2 of 7 Internal View of EUT-3 Internal View of EUT-4 Page 3 of 7 Internal View of EUT-5 Internal View of EUT-6 Page 4 of 7 Internal View of EUT-7 Internal View of EUT-8 Page 5 of 7 Internal View of EUT-9 Internal View of EUT-10 ANT Page 6 of 7 Internal View of EUT-11 Internal View of EUT-12 Page 7 of 7 Internal View of EUT-13

RF EXPOSURE EVALUATION EUT Specification EUT smart door lock Model Number RF-DS91 Series Model / Model Difference / FCC ID 2BTC8-RF-DS91-BT Antenna gain (Max) 2.1dBi Operation Frequency 2402 MHz to 2480 MHz Power Supply DC 5V Battery 6V Classification Per Stipulated Test Standard ß15.247(i), ß2.1093 Modulation GFSK Max. output power -0.34dBm (0.925mW) Test Requirement: According to ß15.247(i) and ß1.1307(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. Routine SAR evaluation refers to that specifically required by ß2.1093, using Page 2 of 2 measurements or computer simulation. When routine SAR evaluation is not required, portable transmitters with output power greater than the applicable low threshold require SAR evaluation to quality for TCB approval. One antenna is available for the EUT. The minimum separation distance is 5mm. Measurement Result BLE: Transmit Frequency (MHz) Mode Measured Power (dBm) Tune up Power (dBm) Max tune up power (dBm) Calculation Result 1-g SAR 2440 BLE 1M -0.34 0±1 1 0.3965 3 Signature: Alan He Date: 2026-7-12

Report Duty Cycle Condition Mode Frequency (MHz) Antenna Duty Cycle (%) Correction Factor (dB) 1/T (kHz) NVNT BLE 1M 2402 Ant1 37.08 4.31 9.62 NVNT BLE 1M 2440 Ant1 36.9 4.33 9.66 NVNT BLE 1M 2480 Ant1 37.01 4.32 9.62 Report Duty Cycle NVNT BLE 1M 2402MHz Ant1 Duty Cycle NVNT BLE 1M 2440MHz Ant1 Report Duty Cycle NVNT BLE 1M 2480MHz Ant1 Report Maximum Peak Conducted Output Power Condition Mode Frequency (MHz) Antenna Conducted Power (dBm) Total Conducted Power (W) Limit Conducted(dBm) Verdict NVNT BLE 1M 2402 Ant1 -0.49 0.00089 30 Pass NVNT BLE 1M 2440 Ant1 -0.34 0.00092 30 Pass NVNT BLE 1M 2480 Ant1 -0.39 0.00091 30 Pass Report Peak Power NVNT BLE 1M 2402MHz Ant1 Peak Power NVNT BLE 1M 2440MHz Ant1 Report Peak Power NVNT BLE 1M 2480MHz Ant1 Report -6dB Bandwidth Condition Mode Frequency (MHz) Antenna -6 dB Bandwidth (MHz) Limit -6 dB Bandwidth (MHz) Verdict NVNT BLE 1M 2402 Ant1 0.6390731447 0.5 Pass NVNT BLE 1M 2440 Ant1 0.6553024455 0.5 Pass NVNT BLE 1M 2480 Ant1 0.6171757962 0.5 Pass Report -6dB Bandwidth NVNT BLE 1M 2402MHz Ant1 -6dB Bandwidth NVNT BLE 1M 2440MHz Ant1 Report -6dB Bandwidth NVNT BLE 1M 2480MHz Ant1 Report Occupied Channel Bandwidth Condition Mode Frequency (MHz) Antenna 99% OBW (MHz) NVNT BLE 1M 2402 Ant1 1.0165 NVNT BLE 1M 2440 Ant1 1.0113 NVNT BLE 1M 2480 Ant1 1.0117 Report OBW NVNT BLE 1M 2402MHz Ant1 OBW NVNT BLE 1M 2440MHz Ant1 Report OBW NVNT BLE 1M 2480MHz Ant1 Report Maximum Power Spectral Density Level Condition Mode Frequency (MHz) Antenna Conducted PSD (dBm/3kHz) Limit (dBm/3kHz) Verdict NVNT BLE 1M 2402 Ant1 -15.4 8 Pass NVNT BLE 1M 2440 Ant1 -15.51 8 Pass NVNT BLE 1M 2480 Ant1 -15.59 8 Pass Report PSD NVNT BLE 1M 2402MHz Ant1 PSD NVNT BLE 1M 2440MHz Ant1 Report PSD NVNT BLE 1M 2480MHz Ant1 Report Band Edge Condition Mode Frequency (MHz) Antenna Max Value (dBc) Limit (dBc) Verdict NVNT BLE 1M 2402 Ant1 -47.56 -20 Pass NVNT BLE 1M 2480 Ant1 -53.22 -20 Pass Report Band Edge NVNT BLE 1M 2402MHz Ant1 Ref Band Edge NVNT BLE 1M 2402MHz Ant1 Emission Report Band Edge NVNT BLE 1M 2480MHz Ant1 Ref Band Edge NVNT BLE 1M 2480MHz Ant1 Emission Report Conducted RF Spurious Emission Condition Mode Frequency (MHz) Antenna Max Value (dBc) Limit (dBc) Verdict NVNT BLE 1M 2402 Ant1 -37.69 -20 Pass NVNT BLE 1M 2440 Ant1 -36.5 -20 Pass NVNT BLE 1M 2480 Ant1 -38.71 -20 Pass Report Tx. Spurious NVNT BLE 1M 2402MHz Ant1 Ref Tx. Spurious NVNT BLE 1M 2402MHz Ant1 Emission Report Tx. Spurious NVNT BLE 1M 2440MHz Ant1 Ref Tx. Spurious NVNT BLE 1M 2440MHz Ant1 Emission Report Tx. Spurious NVNT BLE 1M 2480MHz Ant1 Ref Tx. Spurious NVNT BLE 1M 2480MHz Ant1 Emission

TRF No.: 04-E001-0B TRF Originator: GTG TRF Date: 2023-12-13 Web: www.gtggroup.com E-mail: [email protected] Tel.: 86-400 755 8988 CFR 47 FCC PART 15 SUBPART C TEST REPORT For smart door lock MODEL NUMBER: RF-DS91 REPORT NUMBER: E04A26061481F00101 ISSUE DATE: July 12, 2026 FCC ID: 2BTC8-RF-DS91-BT Prepared for Shenzhen Rongfu Tiancheng Industrial Co., Ltd. Area A, 13th Floor, Building D, Huilongda Industrial Park, Shilong Community, Shiy an Subdistrict, Bao'an District, Shenzhen, Guangdong Province, China Prepared by Guangdong Global Testing Technology Co., Ltd. Room 101-105, 203-210, Building 1, No.2, Keji 8 Road, Songshan Lake Park, Dongguan city, Guangdong, People’s Republic of China, 523808 This report is based on a single evaluation of the submitted sample(s) of the above mentioned product, it does not imply an assessment of the production of the products. This report shall not be reproduced, except in full, without the written approval of Guangdong Global Testing Technology Co., Ltd. REPORT NO.: E04A26061481F00101 Page 2 of 42 TRF No.: 04-E001-0B Global Testing , Great Quality. Revision History Rev. Issue Date Revisions Revised By V0 July 12, 2026 Initial Issue REPORT NO.: E04A26061481F00101 Page 3 of 42 TRF No.: 04-E001-0B Global Testing , Great Quality. Summary of Test Results Test Item Clause Limit/Requirement Result Antenna Requirement N/A FCC Part 15.203/15.247 (c) Pass AC Power Line Conducted Emission ANSI C63.10-2020, Clause 6.2 FCC Part 15.207 Pass Conducted Output Power ANSI C63.10-2020, Clause 11.9.1.2 FCC Part 15.247 (b)(3) Pass 6dB Bandwidth and 99% Occupied Bandwidth ANSI C63.10-2020, Clause 11.8.2 FCC Part 15.247 (a)(2) Pass Power Spectral Density ANSI C63.10-2020, Clause 11.10.2 FCC Part 15.247 (e) Pass Conducted Band edge and spurious emission ANSI C63.10-2020, Clause 11.11 FCC Part 15.247(d) Pass Radiated Band edge and Spurious Emission ANSI C63.10-2020, Clause 11.12 FCC Part 15.247(d) FCC Part 15.205/15.209 Pass Duty Cycle ANSI C63.10-2020, Clause 11.6 None; for reporting purposes only. Pass Note: 1. For ISED, this report is also performed according to ANSI C63.10-2020 + Cor.1-2023 + C63.10a-2024 + Errata to C63.10a-2024 standards. *This test report is only published to and used by the applicant, and it is not for evidence purpose in China. *The measurement result for the sample received is <Pass> according to < CFR 47 FCC PART 15 SUBPART C, ISED RSS-247 Issue 4> when <Accuracy Method> decision rule is applied. REPORT NO.: E04A26061481F00101 Page 4 of 42 TRF No.: 04-E001-0B Global Testing , Great Quality. CONTENTS 1. ATTESTATION OF TEST RESULTS ..................................................................................... 5 2. TEST METHODOLOGY ......................................................................................................... 6 3. FACILITIES AND ACCREDITATION ..................................................................................... 6 4. CALIBRATION AND UNCERTAINTY ................................................................................... 7 4.1. MEASURING INSTRUMENT CALIBRATION ........................................................... 7 4.2. MEASUREMENT UNCERTAINTY ............................................................................ 7 5. EQUIPMENT UNDER TEST .................................................................................................. 8 5.1. DESCRIPTION OF EUT ........................................................................................... 8 5.2. CHANNEL LIST ........................................................................................................ 8 5.3. MAXIMUM CONDUCTED OUTPUT POWER ........................................................... 9 5.4. TEST CHANNEL CONFIGURATION ........................................................................ 9 5.5. THE WORSE CASE POWER SETTING PARAMETER ............................................ 9 5.6. DESCRIPTION OF AVAILABLE ANTENNAS ........................................................... 9 5.7. SUPPORT UNITS FOR SYSTEM TEST ................................................................... 9 5.8. SETUP DIAGRAM .................................................................................................. 10 6. MEASURING EQUIPMENT AND SOFTWARE USED......................................................... 11 7. ANTENNA PORT TEST RESULTS ..................................................................................... 13 7.1. Conducted Output Power ........................................................................................ 13 7.2. 6dB Bandwidth and 99% Occupied Bandwidth ....................................................... 14 7.3. Power Spectral Density ........................................................................................... 16 7.4. Conducted Band edge and spurious emission ........................................................ 17 7.5. Duty Cycle .............................................................................................................. 19 8. RADIATED TEST RESULTS ............................................................................................... 20 8.1. Radiated Band edge and Spurious Emission .......................................................... 26 9. ANTENNA REQUIREMENT ................................................................................................ 37 10. AC POWER LINE CONDUCTED EMISSION ......................................................... 39 11. TEST DATA - APPENDIX A ................................................................................... 42 REPORT NO.: E04A26061481F00101 Page 5 of 42 TRF No.: 04-E001-0B Global Testing , Great Quality. 1. ATTESTATION OF TEST RESULTS Applicant Information Company Name: Shenzhen Rongfu Tiancheng Industrial Co., Ltd. Address: Area A, 13th Floor, Building D, Huilongda Industrial Park, Shilong Community, Shiyan Subdistrict, Bao'an District, Shenzhen, Guangdong Province…

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PCB Antenna for BLE Chips of WCH 1、Dimension of Antenna 2、Features  Dimension: 5.6*12.3mm  Terminal impedance: 50 ohm  Max Gain: 2.1dBi  RF Frequency: 2.4GHz 3、S parameter Working bandwidth: 157MHz S11：[email protected] 4、Gain and Radiation pattern 2.4GHz: E plane： H plane： 2.44GHz： E plane： H plane： 2.48GHz: E plane： H plane：

Setup Photographs Radiated Band edge and Spurious Emission Page 2 of 2 Conducted emissions