2BFOB-SAB4Sand Art Bluetooth Lamp

Dongguan Changhong E-commerce Co. 2024.04.15 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: 2BFOB-SAB4 [Dongguan Changhong E-commerce Co.] (“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) she shi jia Dongguan Changhong E-commerce Co. 2024.04.15 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: 2BFOB-SAB4 [Dongguan Changhong E-commerce Co.] (“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) she shi jia

Dongguan Changhong E-commerce Co. 2024.04.15 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Sand Art Bluetooth Lamp Trademark: N/A MODEL : sa-b- 4 FCC ID : 2BFOB-SAB4 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 - Block Diagram - Schematics - Operational Description required to be submitted with this application be permanently withheld from public review. The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. Please contact me if there is any information you may need. Sincerely, Client’s signature: Client’s name / title : she shi jia /Manager Contact information / address: Room 1202, No.6 Jianwei Middle Street, Dalingshan Town, Dongguan City, Guangdong Province, China.

Dongguan Changhong E-commerce Co. 2024.04.15 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen BCTC Testing 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, Client’s signature: Client’s name / title : she shi jia /Manager Contact information / address: Room 1202, No.6 Jianwei Middle Street, Dalingshan Town, Dongguan City, Guangdong Province, China

External Photos

Size:10*5mm FCC ID:2BFOB-SAB4 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 Label location

Internal Photos Antenna

RF EXPOSURE EVALUATION METHOD FCC ID:2BFOB-SAB4 Applicable standard： In accordance with FCC 47 CFR part 2 (2.1093) this device has been defined as a portable device which is defined as a transmitting device designed to be used so that the radiating structure(s) of the device is/are within 20 centimeters of the body of the user. Portable devices must be evaluated using the specified in FCC 47 CFR part 2 (2.1093) and ANSI/IEEEC95.1-1992. and had been tested in accordance with the measurement methods and procedures specified in IEEE 1528-2003. Per FCC KDB 447498 D01 v06, the 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances s 50 mm are determined by: SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR,where f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation The result is rounded to one decimal place for comparison The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. BT GFSK 2402 -3.88 21 GFSK 2441 -5.19 21 GFSK 2480 -6.33 21 π/ 4 DQPSK 2402 -1.38 21 π/ 4 DQPSK 2441 -2.68 21 π/ 4 DQPSK 2480 -4.02 21 8DPSK 2402 -0.95 21 8DPSK 2441 -2.26 21 8DPSK 2480 -3.61 21 max possible output power (PK,conducted)：0±1dBm 1.7dBi logarithmic terms convert to numeric result is nearly 1.479 1dBm=1.26mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.26/5*√2.402=0.39≤3.0 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.26/5*√2.441=0.39≤3.0 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.26/5*√2.48=0.40≤3.0 Conclusion: 1. [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] * [√f(GHz)] < 3.0. 2. SAR Test Exclusion Thresholds is 3.0 for separation distance 5mm. Therefore, SAR test is not required.

Manufacturer：Dongguan Changhong E-commerce Co. Address: Room 1202, No.6 Jianwei Middle Street, Dalingshan Town, Dongguan City, Guangdong Province, China Product specificationss Quick Reference Date Antenna module on the system board Frequency 2.45GHz *1 Ant. Port Input Pwr. (dBm) 0 (Typ. BT class 2 output power) Tot. Rad. Pwr. (dBm) -2.3 (Input pwr – loss pwr) Peak EIRP(dBm) 1.3 Directivity (dBi) 1 (all direction antenna) Efficiency (dB) -2.3 (58.5%) Gain (dBi) 1.7 (Peak Gain XY-plane) Maximum Power (dBm) 1.3 (XY-plane) Minimum Power (dBm) -4(XY-plane) Avg. Power (dBm) -0.5(XY-plane) Max/Min Ratio (dB) 5.3(XY-plane) Max/Avg Ratio (dB) 1.8(XY-plane) Min/Avg Ratio (dB) -3.5(XY-plane) Average Gain (dB) -0.5 (Avg Gain XY-plane) All the technical data and information contained herein are subject to change without prior notice Antenna Layout & module on the system board Antenna Gain Gain Table Unit in dBi @2.44GHz XY-plane XZ-plane YZ-plane Efficiency Peak Avg. Peak Avg. Peak Avg. Module Board 1.3 -0.5 1.7 -3.8 1.1 -3.0 58.5% Return Loss The Environment of Antenna Radiation Pattern 3D radiation pattern diagram XY-plane XZ-plane YZ-plane

No.：BCTC/RF-EMC-005 Page: 1 of 79 Edition：B.1 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2403414639E Applicant: Dongguan Changhong E-commerce Co. Product Name: Sand Art Bluetooth Lamp Test Model: sa-b-4 Tested Date: 2024-03-29 to 2024-04-12 Issued Date: 2024-04-12 Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 2 of 79 Edition：B.1 FCC ID:2BFOB-SAB4 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 BCTC Testing Co., Ltd, this report can’t be reproduced except in full. The tested sample(s) and the sample information are provided by the client. Product Name: Sand Art Bluetooth Lamp Trademark: N/A Model/Type Reference: sa-b-4 Prepared For: Dongguan Changhong E-commerce Co. Address: Room 1202, No.6 Jianwei Middle Street, Dalingshan Town, Dongguan City, Guangdong Province, China Manufacturer: Dongguan Changhong E-commerce Co. Address: Room 1202, No.6 Jianwei Middle Street, Dalingshan Town, Dongguan City, Guangdong Province, China Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Zhancheng, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2024-03-29 Sample tested Date: 2024-03-29 to 2024-04-12 Issue Date: 2024-04-12 Report No.: BCTC2403414639E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Tang Changyu/ Project Handler Zero Zhou/Reviewer Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 3 of 79 Edition：B.1 Table Of Content Test Report Declaration Page 1. Version .................................................................................................................. 5 2. Test Summary ....................................................................................................... 6 3. Measurement Uncertainty ..................................................................................... 7 4. Product Information And Test Setup ..................................................................... 8 4.1 Product Information ............................................................................................... 8 4.2 Test Setup Configuration ...................................................................................... 8 4.3 Support Equipment ............................................................................................... 9 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ........................................................................................................... 10 4.6 Table Of Parameters Of Text Software Setting ................................................... 10 5. Test Facility And Test Instrument Used ............................................................... 11 5.1 Test Facility ......................................................................................................... 11 5.2 Test Instrument Used .......................................................................................... 11 6. Conducted Emissions .......................................................................................... 13 6.1 Block Diagram Of Test Setup .............................................................................. 13 6.2 Limit .................................................................................................................... 13 6.3 Test procedure .................................................................................................... 13 6.4 EUT operating Conditions ................................................................................... 13 6.5 Test Result .......................................................................................................... 14 7. Radiated emissions ............................................................................................. 16 7.1 Block Diagram Of Test Setup .............................................................................. 16 7.2 Limit .................................................................................................................... 17 7.3 Test procedure .................................................................................................... 18 7.4 EUT operating Conditions ................................................................................... 19 7.5 Test Result .......................................................................................................... 19 8. Radiated Band Emission Measurement And Restricted Bands Of Operation ..... 23 8.1 Block Diagram Of Test Setup .............................................................................. 23 8.2 Limit .................................................................................................................... 23 8.3 Test procedure .................................................................................................... 24 8.4 EUT operating Conditions ................................................................................... 24 8.5 Test Result .......................................................................................................... 25 9. Spurious RF Conducted Emissions ..................................................................... 26 9.1 Block Diagram Of Test Setup .............................................................................. 26 9.2 Limit .................................................................................................................... 26 9.3 Test procedure .................................................................................................... 26 9.4 Test Result ......................................................................................…

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Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 53 of 79 Edition：B.1 -20dB Bandwidth NVNT 3-DH1 2480MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 54 of 79 Edition：B.1 11. Maximum Peak Output Power 11.1 Block Diagram Of Test Setup 11.2 Limit FCC Part15 (15.247) , Subpart C Section Test Item Limit Frequency Range (MHz) Result 15.247(b)(1) Peak Output Power 0.125 watt or 21dBm 2400-2483.5 PASS 11.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 2MHz. VBW = 6MHz. Sweep = auto; Detector Function = Peak. 3. Keep the EUT in transmitting at lowest, medium and highest channel individually. Record the max value. 11.4 Test Result Temperature: 26°C Relative Humidity: 54% Test Voltage: DC 3.7V Remark: N/A Condition Mode Frequency (MHz) Conducted Power (dBm) Limit (dBm) Verdict NVNT 1-DH1 2402 -3.88 21 Pass NVNT 1-DH1 2441 -5.19 21 Pass NVNT 1-DH1 2480 -6.59 21 Pass NVNT 2-DH1 2402 -1.38 21 Pass NVNT 2-DH1 2441 -2.68 21 Pass NVNT 2-DH1 2480 -4.02 21 Pass NVNT 3-DH1 2402 -0.95 21 Pass NVNT 3-DH1 2441 -2.26 21 Pass NVNT 3-DH1 2480 -3.61 21 Pass Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 55 of 79 Edition：B.1 Test Graphs Power NVNT 1-DH1 2402MHz Power NVNT 1-DH1 2441MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 56 of 79 Edition：B.1 Power NVNT 1-DH1 2480MHz Power NVNT 2-DH1 2402MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 57 of 79 Edition：B.1 Power NVNT 2-DH1 2441MHz Power NVNT 2-DH1 2480MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 58 of 79 Edition：B.1 Power NVNT 3-DH1 2402MHz Power NVNT 3-DH1 2441MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 59 of 79 Edition：B.1 Power NVNT 3-DH1 2480MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 60 of 79 Edition：B.1 12. Hopping Channel Separation 12.1 Block Diagram Of Test Setup 12.2 Limit Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hopping channel, whichever is greater. Alternatively, frequency hopping systems operating in the 2400-2483.5 MHz band may have hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the hopping channel, whichever is greater, provided the systems operate with an output power no greater than 0.125W. 12.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 30kHz. VBW = 100kHz , Span = 2.0MHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. The limit is specified in one of the subparagraphs of this Section Submit this plot. 12.4 Test Result Condition Mode Hopping Freq1 (MHz) Hopping Freq2 (MHz) HFS (MHz) Limit (MHz) Verdict NVNT 1-DH1 2401.972 2402.972 1 0.549 Pass NVNT 1-DH1 2440.968 2441.97 1.002 0.552 Pass NVNT 1-DH1 2478.966 2479.966 1 0.559 Pass NVNT 2-DH1 2401.972 2402.972 1 0.833 Pass NVNT 2-DH1 2440.97 2441.97 1 0.822 Pass NVNT 2-DH1 2478.966 2479.964 0.998 0.833 Pass NVNT 3-DH1 2401.972 2402.972 1 0.803 Pass NVNT 3-DH1 2440.968 2441.97 1.002 0.81 Pass NVNT 3-DH1 2478.964 2479.964 1 0.809 Pass Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 61 of 79 Edition：B.1 Test Graphs CFS NVNT 1-DH1 2402MHz CFS NVNT 1-DH1 2441MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 62 of 79 Edition：B.1 CFS NVNT 1-DH1 2480MHz CFS NVNT 2-DH1 2402MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 63 of 79 Edition：B.1 CFS NVNT 2-DH1 2441MHz CFS NVNT 2-DH1 2480MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 64 of 79 Edition：B.1 CFS NVNT 3-DH1 2402MHz CFS NVNT 3-DH1 2441MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 65 of 79 Edition：B.1 CFS NVNT 3-DH1 2480MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 66 of 79 Edition：B.1 13. Number Of Hopping Frequency 13.1 Block Diagram Of Test Setup 13.2 Limit Frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels. 13.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 100kHz. VBW = 300kHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. It may prove necessary to break the span up to sections. in order to clearly show all of the hopping frequencies. The limit is specified in one of the subparagraphs of this Section. 4. Set the spectrum analyzer: Start Frequency = 2.4GHz, Stop Frequency = 2.4835GHz. Sweep=auto; 13.4 Test Result Condition Mode Hopping Number Limit Verdict NVNT 1-DH1 79 15 Pass NVNT 2-DH1 79 15 Pass NVNT 3-DH1 79 15 Pass Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 67 of 79 Edition：B.1 Test Graphs Hopping No. NVNT 1-DH1 2441MHz Hopping No. NVNT 2-DH1 2441MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 68 of 79 Edition：B.1 Hopping No. NVNT 3-DH1 2441MHz Report No.:BCTC2403414639E No.：BCTC/RF-EMC-005 Page: 69 of 79 Edition：B.1 14. Dwell Time 14.1 Block Diagram Of Test Setup 14.2 Limit Frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels. The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. Frequency hopping systems may avoid or suppress transmissions on a particular hopping frequency provided that a minimum of 15 channels are used. 14.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set spectrum analyzer span = 0. Centred on a hopping channel; 3. Set RBW = 1MHz and VBW = 3MHz.Sweep = as necessary to capture the entire dwell time per hopping channel. Set the EUT for DH5, DH3 and DH1 p…

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17. EUT Test Setup Photographs Conducted Emissions Photo Radiated Measurement Photos