2BXEY-S4G550F2SMART WHITEBOARD

Dongguan Sunvol Information Technology Co., Ltd. 2026.9.02 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 2BXEY-S4G550F2 [Dongguan Sunvol Information 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. We also certify that, as of the date of the filing of the application, the equipment does not utilize cyber-security or anti-virus software from Kaspersky Lab, Inc, or any of its successors and assignees, which is also on the “covered list”. Sincerely, (Applicant signature) (Applicant printed name) ：mei liu Dongguan Sunvol Information Technology Co., Ltd. 2026.9.02 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 2BXEY-S4G550F2 [Dongguan Sunvol Information 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) ：mei liu

Dongguan Sunvol Information Technology Co., Ltd. 2026.9.02 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (SMART WHITEBOARD / S4G550F2/FCC ID: 2BXEY-S4G550F2) 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 (SCH，Block Diagram，Operational Description, Software Security Requirements for UNII devices) required to be submitted with this application be permanently withheld from public review. the above documents are company proprietary information that could never get into the possession of your competition. Please contact me if there is any information you may need. Sincerely, Applicant’s Name: mei liu Title: Manager Signature:

Dongguan Sunvol Information Technology Co., Ltd. 2026.9.02 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 ETR Standard Technology Co., Ltd. Smith Chen 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, Applicant’s Name: mei liu Title: Manager Signature:

Dongguan Sunvol Information Technology Co., Ltd. 2026.9.02 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: Short Term Confidentiality Request For(SMART WHITEBOARD / S4G550F2/FCC ID: 2BXEY-S4G550F2) To Whom It May Concern: In accordance with sections 0.457 and 0.459 of CFR 47, < Dongguan Sunvol Information Technology Co., Ltd.>. requests short-term Confidentiality of following sections of this application for a period of 180 days after grant is issued. Test setup photos External photos Internal photos User’s manual These documents contain detailed system and equipment descriptions and related information about the product, which < Dongguan Sunvol Information Technology Co., Ltd. > considers to be proprietary, confidential, and a custom design and otherwise, would not release to the general public. Since this design is a basis from which future technological products will evolve, < Dongguan Sunvol Information Technology Co., Ltd.> feels that this information would be of benefit to its competitors, and that the disclosure of the information in these documents would give our competitors an unfair advantage in the market. Please contact me if there is any information you may need. Sincerely, Applicant’s Name: mei liu Title: Manager Signature:

92.5mm*65mm

FCC ID: 2BXEY-S4G550F2 RF Exposure Evaluation Limits According to47 CFR Part 2.1091 and 447498 D01 General RF Exposure Guidance v06 The criteria listed in the following table shall be used to evaluate the environment impact of 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/cm 2 ) Averaging time (minutes) (A) Limits for Occupational/Controlled Exposures 0.3–3.0 614 1.63 *(100) 6 3.0–30 1842/f 4.89/f *(900/f 2 ) 6 30–300 61.4 0.163 1.0 6 300–1500 f/300 6 1500–100,000 5 6 (B) Limits for General Population/Uncontrolled Exposure 0.3–1.34 614 1.63 *(100) 30 1.34–30 824/f 2.19/f *(180/f 2 ) 30 30–300 27.5 0.073 0.2 30 300–1500 f/1500 30 1500–100,000 1.0 30 f = frequency in MHz Friis transmission formula: Pd = (Pout*G)/(4*pi*r 2 ) Where Pd = power density in mW/cm 2 , Pout = output power to antenna in mW; G = gain of antenna in linear scale, Pi = 3.1416; R = distance between observation point and center of the radiator in cm Pd id the limit of MPE, 1 mW/cm 2 . If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually. FCC ID: 2BXEY-S4G550F2 Test Result of RF Exposure Evaluation The source of the evaluation data results is based on the test report ET-26083914E01/02/03 BLE Antenna gain=3.72dBi 2.4G WIFI Antenna gain=3.72dBi 5G WIFI Antenna gain=5.51dBi FOR BLE Mode Output power (dBm) Tune-up power (dBm) Max Tune-up (dBm) Max Tune-up (mW) Numeric antenna gain Power Density at R=20cm (mW/cm2) Limit (mW/cm2) Result GFSK 3.88 4±1 5 3.16 2.36 0.0015 1.0 PASS FOR 2.4GWIFI Mode Output power (dBm) Tune-up power (dBm) Max Tune-up (dBm) Max Tune-up (mW) Numeric antenna gain Power Density at R=20cm (mW/cm2) Limit (mW/cm 2 ) Result 802.11b 14.14 14±1 15 31.62 2.36 0.0149 1.0 PASS 802.11g 14.51 15±1 16 39.81 2.36 0.0187 1.0 PASS 802.11n20 14.68 15±1 16 39.81 2.36 0.0187 1.0 PASS 802.11n40 13.48 13±1 14 25.12 2.36 0.0118 1.0 PASS FOR 5.8GWIFI Mode Output power (dBm) Tune-up power (dBm) Max Tune-up (dBm) Max Tune-up (mW) Numeric antenna gain Power Density at R=20cm (mW/cm2) Limit (mW/cm 2 ) Result 802.11a 14.20 14±1 15 31.62 3.56 0.0224 1.0 PASS 802.11n20 14.48 14±1 15 31.62 3.56 0.0224 1.0 PASS 802.11ac20 14.59 15±1 16 39.81 3.56 0.0282 1.0 PASS 802.11n40 13.26 13±1 14 25.12 3.56 0.0178 1.0 PASS 802.11ac40 13.18 13±1 14 25.12 3.56 0.0178 1.0 PASS 802.11ac80 12.73 13±1 14 25.12 3.56 0.0178 1.0 PASS If BT and WIFI work simultaneously BLE+2.4G WIFI+5GWIFI, the total power density is 0.0015/1+0.0187/1+0.0282/1=0.0484<1. Maximum power density=0.0484<1. Then SAR evaluation is not require .

Test Repor Antenna measurement t Customer：Amdox RF：ZQX Date：2026-07-15 Version：V01 Shenzhen Chufeng Communication Technology Co., LTD Shenzhen ChuFeng Communication Technology Co., LTD Shenzhen Chufeng Communication Technology Co., LTD Contents 1.Project information 2.Test environment of test sample machine 3.Laboratory test environment and equipment 4.Antenna RF line matching 5.Antenna RF line matching 6.Antenna product diagram 7.Summary Shenzhen Chufeng Communication Technology Co., LT Antenna test laboratory environment D S11、 S12 、VSWR 、 LOS Test item Testing equipment S Efficiency、 Gain 3D Radiation Patter Network analyzer E5071C、 ZVB8 n TRP、 TI SG24 Dark room、 E5071C S SG24 Dark room、 CMW500 Laboratory test environment and equipment Shenzhen Chufeng Communication Technology Co., LTD Shenzhen Chufeng Communication Technology Co., LT Antenna test laboratory environment D Elemen Main antenna tValue E1(0402 Figure caption ) 、 E2(0402 No modifications were made to the original matching circuit. ) 、 E3(0402) 、 E4(0402) 、 Main antenna matching circuit Shenzhen Chufeng Communication Technology Co., LTD E1 E4 E2 RF Module Antenna E3 Antenna Test Data Specifications Shenzhen Chufeng Communication Technology Co., LTD Freqency(MHz) Gain(dBi Frequency (MHz) ) Efficiency(dB Gain (dBi) ) Efficiency(% 功Power ratio (dB) ) Radiation power (%) VSWR/LOSS/ Voltage standing wave/loss Shenzhen Chufeng Communication Technology Co., LTD Shenzhen Chufeng Communication Technology Co., LT Antenna passive test data D Freqency(MHz)Gain(dBi)Efficiency(dB)Efficiency(%) 24003.75-4.0639.27 24053.72-4.138.86 24103.63-4.1238.71 24153.55-4.1138.82 24203.47-4.0639.26 24253.38-3.9840.04 24303.36-3.8840.93 24353.27-3.8741.07 24403.17-3.8741.01 24453.13-3.8641.11 24503.19-3.8141.56 24553.21-3.841.7 24603.17-3.8641.08 24653.19-3.9440.38 24703.25-4.0139.76 24753.25-4.0839.06 24803.17-4.1738.28 Freqency(MHz)Gain(dBi)Efficiency(dB)Efficiency(%) 24852.88-4.3436.77 24902.36-4.5834.85 24951.71-4.8432.79 25001.13-5.0731.09 51504.86-4.7633.45 51754.58-4.9332.15 52004.61-4.7733.31 52254.56-4.6834.03 52504.45-4.4835.64 52754.34-4.337.17 53004.62-4.0938.95 53254.65-4.1538.5 53504.65-4.2537.56 53754.38-4.3336.89 54004-4.5535.08 54253.51-4.7933.2 54503.64-4.5535.11 Freqency(MHz)Gain(dBi)Efficiency(dB)Efficiency(%) 54753.55-4.733.91 55004.03-4.5135.4 55254.12-4.5934.79 55504.6-4.138.89 55754.78-4.0339.5 56004.82-4.0439.43 56254.81-4.0739.16 56504.63-4.0539.39 56754.38-4.1638.41 57004.41-439.85 57254.56-3.7442.24 57504.61-3.6343.34 57754.79-3.5843.85 58004.92-3.5743.95 58255.04-3.4944.8 58505.51-3.5144.53 Shenzhen Chufeng Communication Technology Co., LT 2D radiation direction diagram D 2400MH 3D direction diagram Z 2450MHZ 2500MHZ 5150MHZ 5550MHZ 5850MHZ Shenzhen Chufeng Communication Technology Co., LTD ShenzhenChufengCommunicationTechnologyCo.,LTD Processing size drawing THE END ShenzhenChufengCommunicationTechnologyCo., LTD

Report No.: ET-26083914E03 This test report is valid for the tested samples only. It cannot be reproduced except in full without prior written consent of Shenzhen ETR Standard Technology Co., Ltd. TEST REPORT Applicant: Dongguan Sunvol Information Technology Co., Ltd. Address of Applicant: Unit 1, Building 11, No. 5, Keji 10th Road, Songshanhu Park, Dongguan City, Guangdong Province, China Manufacturer: Dongguan Sunvol Information Technology Co., Ltd. Address of Manufacturer: Unit 1, Building 11, No. 5, Keji 10th Road, Songshanhu Park, Dongguan City, Guangdong Province, China Product Name: SMART WHITEBOARD Model No.: S4G550F2 Trade Mark: AMDOXTECH FCC ID: 2BXEY-S4G550F2 Applicable standards: FCC CFR Title 47 Part 15 Subpart E Section 15.407 Date of Test: Aug.08, 2026-Aug.12, 2026 Date of report issued: Aug.13, 2026 Remark: The results shown in this test report refer only to the sample(s) tested , this test report cannot be reproduced, except in full without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of compiler and approver Prepared By Shenzhen ETR Standard Technology Co., Ltd. Address: No.103, No.10, Phase I, Zone 3, Xinxing Industrial Park, Xinhe, Fuhai Street, Bao'an District, Shenzhen, Guangdong, China Compiled by: Reviewed by: Approved by: Project Engineer Project Manager Authorized Signature - Page 2 of 58 Report No.: ET-26083914E03 Tel:(86-0755) 85259392 Email:[email protected] Web: www.etrlab.cn No.103, No.10, Phase I, Zone 3, Xinxing Industrial Park, Xinhe, Fuhai Street, Bao'an District, Shenzhen, Guangdong, China Report Revision History Report No. Description Issue Date ET-26083914E03 Original Aug.13, 2026 - Page 3 of 58 Report No.: ET-26083914E03 Tel:(86-0755) 85259392 Email:[email protected] Web: www.etrlab.cn No.103, No.10, Phase I, Zone 3, Xinxing Industrial Park, Xinhe, Fuhai Street, Bao'an District, Shenzhen, Guangdong, China Contents Page 1 TEST SUMMARY ......................................................................................................................................4 1.1 MEASUREMENT UNCERTAINTY .............................................................................................................4 2 GENERAL INFORMATION .......................................................................................................................5 2.1 GENERAL DESCRIPTION OF EUT ..........................................................................................................5 2.2 TEST MODE .........................................................................................................................................7 2.3 DESCRIPTION OF SUPPORT UNITS ........................................................................................................8 2.4 TEST FACILITY ....................................................................................................................................8 2.5 ADDITIONAL INSTRUCTIONS ..................................................................................................................8 3 TEST INSTRUMENTS LIST ......................................................................................................................9 4 TEST RESULTS AND MEASUREMENT DATA .....................................................................................10 4.1 ANTENNA REQUIREMENT ....................................................................................................................10 4.2 CONDUCTED EMISSIONS ....................................................................................................................11 4.3 DUTY CYCLE ......................................................................................................................................14 4.4 CONDUCTED OUTPUT POWER ............................................................................................................17 4.5 OCCUPY BANDWIDTH ........................................................................................................................18 4.6 BAND EDGE .......................................................................................................................................35 4.6.1 Conducted test Method ...............................................................................................................35 4.6.2 Radiated test Method ..................................................................................................................43 4.7 SPURIOUS EMISSION .........................................................................................................................51 4.7.1 Radiated Emission Method .........................................................................................................51 5 TEST SETUP PHOTO .............................................................................................................................58 6 EUT CONSTRUCTIONAL DETAILS .......................................................................................................58 - Page 4 of 58 Report No.: ET-26083914E03 Tel:(86-0755) 85259392 Email:[email protected] Web: www.etrlab.cn No.103, No.10, Phase I, Zone 3, Xinxing Industrial Park, Xinhe, Fuhai Street, Bao'an District, Shenzhen, Guangdong, China 1 Test Summary Test Item Section in CFR 47 Result Test by Antenna requirement 47CFR part 15.203 Pass / AC Power Line Conducted Emission 47CFR part 15.207 Pass Jason Huang Conducted Output Power 47CFR part 15.407 (a)(1)/(a)(3) Pass Oliver Wang 26dB Bandwidth 47CFR part 15.407 (a)(12) Pass Oliver Wang 6dB Bandwidth 47CFR part 15.407 (e) Pass Oliver Wang Power Spectral Density 47CFR part 15.407(a)(1)/(a)(3) Pass Oliver Wang Band Edge 47CFR part 15.407(b)(1)/(b)(4) Pass Oliver Wang Spurious Emission 47CFR part 15.205/15.209 47CFR part 15.407(b)(1)/(b)(4)/(b)(8) Pass Jason Huang Remarks: 1. Pass: The EUT complies with the essential requi…

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