2BKGU-QDXHCNH10MUSB LED Smart string light

dong guan city qi dian xing optoelectronic technology co. ltd (November 22, 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: 2BKGU-QDXHCNH10M [dong guan city qi dian xing optoelectronic 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) Lei Li dong guan city qi dian xing optoelectronic technology co. ltd (November 22, 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: 2BKGU-QDXHCNH10M [dong guan city qi dian xing optoelectronic 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) Lei Li

dong guan city qi dian xing optoelectronic technology co. ltd Model Difference Data：November 22, 2024 Product description: USB LED Smart string light Model name: QDXHCNH-10M, QDXHCNH-1M, QDXHCNH-2M, QDXHCNH- 3M, QDXHCNH-4M, QDXHCNH-5M, QDXHCNH-6M, QDXHCNH-7M, QDXHCNH-8M, QDXHCNH-9M Trade Name: FCC ID: 2BKGU-QDXHCNH10M All the model are the same circuit and RF module, only the name, appearance and color are different. Regards Sincerely Client’s signature : Client’s name / title : Lei Li（manager） Contact information / address：Room 401, Building 12, No.3 Yongtai Road, Tangxia Town Dongguan City, Guangdong Province, China

dong guan city qi dian xing optoelectronic technology co. ltd (November 22, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (USB LED Smart string light / QDXHCNH-10M, QDXHCNH-1M, QDXHCNH-2M, QDXHCNH-3M, QDXHCNH- 4M, QDXHCNH-5M, QDXHCNH-6M, QDXHCNH-7M, QDXHCNH-8M, QDXHCNH-9M / FCC ID: 2BKGU-QDXHCNH10M) 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: Lei Li Title: manager

dong guan city qi dian xing optoelectronic technology co. ltd (November 22, 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: Lei Li Title: manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 4 Model: QDXHCNH-10M External Photos 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 ID: 2BKGU-QDXHCNH10M Model No.: QDXHCNH-10M

FCC §15.247 (i), §2.1091 – RF Exposure FCC ID: 2BKGU-QDXHCNH10M 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 BLE GFSK& MCH 1±1 2 1.5849 1.0399 (0.17dBi) 0.0003 1 Pass

Antenna Study  Project Name ： ZJ-BCUAS-HCQ2-1K-S  Debugging frequency band: 2400 ‐ 2500HMz  Valuation date ： 2024.10.28 8  Client Name:JM Zengge Co.,Ltd 1 PCB Antenna 2 Testing 3D microwave darkroom(6m*6m*6m) Testing environment PCB Antenna 3 Antenna • Antenna name: 2.4G • Antenna Type ： PCB • Covers ： 2400/2500MHz 4 S Parameter_Return Loss&VSWR‐Smith 5 Efficiency and Gain Frequency ID 1 2 3 4 5 6 7 8 9 10 11 Frequency (MHz) 2400.0 2410.0 2420.0 2430. 0 2440.0 2450.0 2460.0 2470.0 2480.0 2490.0 2500.0 Gain (dBi) -0.46 0.03 -0.31 -0.32 -0.15 0. 00 0.13 0.13 0.17 0.39 0.43 Efficiency (%) 27.44 27.20 25.18 25.35 26.65 27.47 29.99 30.30 27.76 26.91 27.00 2400.0MHz Total, Eff: 27.4%Back View2400.0MHz Total(E1-XZ), Max= -0.46dBi2400.0MHz Total(E2-YZ), Max= -3.25dBiTotal(H-XY), Max= -2.05dBi, CirD=6.51 -0.46 -2.3 -4.15 -5.99 -7.83 -9.67 -11.52 -13.36 -15.2 -17.04 -18.88 -20.73 -22.57 -24.41 -26.25 -28.09 -29.94 -31.78 2410.0MHz Total, Eff: 27.2%Back View2410.0MHz Total(E1-XZ), Max= 0.03dBi2410.0MHz Total(E2-YZ), Max= -3.48dBiTotal(H-XY), Max= -2.14dBi, CirD=6.81 0.03 -1.81 -3.65 -5.5 -7.34 -9.18 -11.02 -12.86 -14.71 -16.55 -18.39 -20.23 -22.07 -23.92 -25.76 -27.6 -29.44 -31.28 2420.0MHz Total, Eff: 25.2%Back View2420.0MHz Total(E1-XZ), Max= -0.31dBi2420.0MHz Total(E2-YZ), Max= -3.39dBiTotal(H-XY), Max= -2.39dBi, CirD=7.76 -0.31 -2.15 -4 -5.84 -7.68 -9.52 -11.36 -13.21 -15.05 -16.89 -18.73 -20.57 -22.42 -24.26 -26.1 -27.94 -29.78 -31.63 2430.0MHz Total, Eff: 25.3%Back View2430.0MHz Total(E1-XZ), Max= -0.32dBi2430.0MHz Total(E2-YZ), Max= -2.98dBiTotal(H-XY), Max= -2.50dBi, CirD=8.61 -0.32 -2.16 -4.01 -5.85 -7.69 -9.53 -11.37 -13.22 -15.06 -16.9 -18.74 -20.58 -22.43 -24.27 -26.11 -27.95 -29.8 -31.64 2440.0MHz Total, Eff: 26.6%Back View2440.0MHz Total(E1-XZ), Max= -0.15dBi2440.0MHz Total(E2-YZ), Max= -2.82dBiTotal(H-XY), Max= -2.13dBi, CirD=8.74 -0.15 -2 -3.84 -5.68 -7.52 -9.37 -11.21 -13.05 -14.89 -16.73 -18.58 -20.42 -22.26 -24.1 -25.94 -27.79 -29.63 -31.47 2450.0MHz Total, Eff: 27.5%Back View2450.0MHz Total(E1-XZ), Max= 0.00dBi2450.0MHz Total(E2-YZ), Max= -3.07dBiTotal(H-XY), Max= -1.98dBi, CirD=8.14 0 -1.84 -3.68 -5.52 -7.37 -9.21 -11.05 -12.89 -14.73 -16.58 -18.42 -20.26 -22.1 -23.94 -25.79 -27.63 -29.47 -31.31 2460.0MHz Total, Eff: 30.0%Back View2460.0MHz Total(E1-XZ), Max= 0.13dBi2460.0MHz Total(E2-YZ), Max= -2.52dBiTotal(H-XY), Max= -1.67dBi, CirD=6.96 0.13 -1.72 -3.56 -5.4 -7.24 -9.09 -10.93 -12.77 -14.61 -16.45 -18.3 -20.14 -21.98 -23.82 -25.66 -27.51 -29.35 -31.19 2470.0MHz Total, Eff: 30.3%Back View2470.0MHz Total(E1-XZ), Max= 0.13dBi2470.0MHz Total(E2-YZ), Max= -2.60dBiTotal(H-XY), Max= -1.92dBi, CirD=6.01 0.13 -1.71 -3.56 -5.4 -7.24 -9.08 -10.92 -12.77 -14.61 -16.45 -18.29 -20.13 -21.98 -23.82 -25.66 -27.5 -29.34 -31.19 2480.0MHz Total, Eff: 27.8%Back View2480.0MHz Total(E1-XZ), Max= 0.17dBi2480.0MHz Total(E2-YZ), Max= -3.25dBiTotal(H-XY), Max= -2.61dBi, CirD=5.98 0.17 -1.67 -3.51 -5.35 -7.2 -9.04 -10.88 -12.72 -14.56 -16.41 -18.25 -20.09 -21.93 -23.77 -25.62 -27.46 -29.3 -31.14 2490.0MHz Total, Eff: 26.9%Back View2490.0MHz Total(E1-XZ), Max= 0.39dBi2490.0MHz Total(E2-YZ), Max= -3.03dBiTotal(H-XY), Max= -2.93dBi, CirD=7.20 0.39 -1.46 -3.3 -5.14 -6.98 -8.82 -10.67 -12.51 -14.35 -16.19 -18.03 -19.88 -21.72 -23.56 -25.4 -27.25 -29.09 -30.93 2500.0MHz Total, Eff: 27.0%Back View2500.0MHz Total(E1-XZ), Max= 0.43dBi2500.0MHz Total(E2-YZ), Max= -2.55dBiTotal(H-XY), Max= -2.55dBi, CirD=8.56 0.43 -1.41 -3.25 -5.09 -6.94 -8.78 -10.62 -12.46 -14.3 -16.15 -17.99 -19.83 -21.67 -23.51 -25.36 -27.2 -29.04 -30.88 Manufacturer: dong guan city qi dian xing optoelectronic technology co. ltd Address: Room 401, Building 12, No.3 Yongtai Road, Tangxia Town Dongguan City, Guangdong Province, China

Report Tel: 4008-707-283Web: http://www.ctb-lab.net Page 1 of 34 TEST REPORT Compiled by: Reviewed by: Approved by: Zhou Kui Arron Liu Bin Mei / Director Note: 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: USB LED Smart string light FCC ID: 2BKGU-QDXHCNH10M Trademark: Model Number: QDXHCNH-10M, QDXHCNH-1M, QDXHCNH-2M, QDXHCNH-3M, QDXHCNH-4M, QDXHCNH-5M, QDXHCNH-6M, QDXHCNH-7M, QDXHCNH-8M, QDXHCNH-9M Prepared For: dong guan city qi dian xing optoelectronic technology co. ltd Address: Room 401, Building 12, No.3 Yongtai Road, Tangxia Town Dongguan City, Guangdong Province, China Manufacturer: dong guan city qi dian xing optoelectronic technology co. ltd Address: Room 401, Building 12, No.3 Yongtai Road, Tangxia Town Dongguan City, Guangdong Province, China Prepared By: Shenzhen CTB Testing Technology Co., Ltd. Address: 1&2/F., Building A, No.26, Xinhe Road, Xinqiao, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: Nov. 11, 2024 Sample tested Date: Nov. 11, 2024 to Nov. 12, 2024 Issue Date: Nov. 12, 2024 Report No.: CTB24111106603RF01 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2013 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB24111106603RF01 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 34 TABLE OF CONTENT Test Report Declaration Page 1. VERSION ........................................................................................................................................ 3 2. TEST SUMMARY ........................................................................................................................... 4 3. MEASUREMENT UNCERTAINTY ................................................................................................. 5 4. PRODUCT INFORMATION AND TEST SETUP ............................................................................ 6 4.1 Product Information .......................................................................................................................... 6 4.2 Test Setup Configuration .................................................................................................................. 6 4.3 Support Equipment........................................................................................................................... 6 4.4 Channel List ..................................................................................................................................... 7 4.5 Test Mode ........................................................................................................................................ 7 4.6 Test Environment ............................................................................................................................. 7 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................................................... 8 5.1 Test Facility ...................................................................................................................................... 8 5.2 Test Instrument Used ....................................................................................................................... 8 6. AC POWER LINE CONDUCTED EMISSION ................................................................................ 10 6.1 Block Diagram Of Test Setup ......................................................................................................... 10 6.2 Limit ................................................................................................................................................ 10 6.3 Test procedure ............................................................................................................................... 10 6.4 Test Result ..................................................................................................................................... 12 7. RADIATED SPURIOUS EMISSION ............................................................................................. 14 7.1 Block Diagram Of Test Setup ......................................................................................................... 14 7.2 Limit ................................................................................................................................................ 14 7.3 Test procedure ............................................................................................................................... 15 7.4 Test Result ..................................................................................................................................... 16 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS ............................................... 23 8.1 Block Diagram Of Test Setup ......................................................................................................... 23 8.2 Limit ................................................................................................................................................ 23 8.3 Test procedure ............................................................................................................................... 23 8.4 Test Result ................................................................................................................…

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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: QDXHCNH-10M 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