2ARMK-ADMA04W-32Wall-mounted 32 inch LCD Signage with Writing-board

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GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date:20201-03-01 Subject; Request for Long Term Confidentiality FCC ID: 2ARMK-ADMA04W-32 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely, Signature: Name: CHUNG MING LIU Title: General manager

GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. No. 75, Pacific Ind. Zone, XingtangTown, Zengcheng, Guangzhou, 511340 China Agent Authorization Company: GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. Address: No. 75, Pacific Ind. Zone, Xingtang Town, Zengcheng, Guangzhou, 511340 China Product Name: Wall-mounted 32 inch LCD Signage with Writing-board Model Number(s): ADMA04W-32 Product Description: Wall-mounted 32 inch LCD Signage with Writing-board We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: 2021-03-01 Name:CHUNG MING LIU Title:GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. Company: General manager

Page 1 of 4 Appendix B: Photographs of EUT Product: Wall-mounted 32 inch LCD Signage with Writing-board Model: ADMA04W-32 External Photos Page 2 of 4 Page 3 of 4 Page 4 of 4

50.8mm 25.4mm Product : Wall-mounted 32 inch LCD Signage with Writing-board Model No. : ADMA04W-32 FCC ID : 2ARMK-ADMA04W-32 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. 7.25mm 32" LCD Label Artwork and Location Model: ADMA04W-32 Label and Size: Location

Page 1 of 13 Appendix B: Photographs of EUT Product: Wall-mounted 32 inch LCD Signage with Writing-board Model: ADMA04W-32 Internal Photos Page 2 of 13 Page 3 of 13 Page 4 of 13 Page 5 of 13 Page 6 of 13 Page 7 of 13 Antenna Page 8 of 13 Page 9 of 13 Page 10 of 13 Page 11 of 13 Page 12 of 13 Page 13 of 13

Maximum Permissible Exposure Applicable Standard According to §1.1307(b), systems operating under the provisions of this section shall be operated in a manner that ensure that the public is not exposed to radio frequency energy level in excess of the Commission’s guideline. Remark: 1) For BT: The maximum output power for antenna is 1.53dBm (1.42mW) at 2480MHz, 5dBi antenna gain(with 3.16 numeric antenna gain.) For WIFI: The maximum output power for antenna is 10.65dBm (11.61mW) at 2412MHz, 5dBi antenna gain(with 3.16 numeric antenna gain.) 2) For mobile or fixed location transmitters, no SAR consideration applied. The minimum separation generally be used is at least 20cm, even if the calculation indicate that the MPE distance would be lesser. For BT: Maximum Permissible Exposure output power= 1.42mW Numeric Antenna gain= 3.16 Substituting the MPE safe distance using d=20cm into above equation. Yields: S=0.000199*P*G Where P=Power in mW G=Numeric antenna gain S=Power density in mW/cm 2 Power density= 0.000893mW/cm 2 For WIFI: Maximum Permissible Exposure output power= 11.61mW Numeric Antenna gain= 3.16 Substituting the MPE safe distance using d=20cm into above equation. Yields: S=0.000199*P*G Where P=Power in mW G=Numeric antenna gain S=Power density in mW/cm 2 Power density= 0.007301mW/cm 2 (For mobile or fixed location transmitters, the maximum power density is 1.0 mW/cm 2 even if the calculation indicates that the power density would be larger.)

Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TEST REPORT FCC ID: 2ARMK-ADMA04W-32 Product: Wall-mounted 32 inch LCD Signage with Writing-board Model No.: ADMA04W-32 Additional Model No.: N/A Trade Mark: YG displays Report No.: TCT201230E048 Issued Date: Jan. 25, 2021 Issued for: GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. No. 75, Pacific Ind. Zone, Xingtang Town, Zengcheng, Guangzhou, 511340 China Issued By: Shenzhen Tongce Testing Lab. 1B/F., Building 1, Yibaolai Industrial Park, Qiaotou, Fuyong, Baoan District, Shenzhen, Guangdong, China TEL: +86-755-27673339 FAX: +86-755-27673332 Note: This report shall not be reproduced except in full, without the written approval of Shenzhen Tongce Testing Lab. This document may be altered or revised by Shenzhen Tongce Testing Lab. personnel only, and shall be noted in the revision section of the document. The test results in the report only apply to the tested sample. Report No.: TCT201230E048 Page 2 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com TABLE OF CONTENTS 1. Test Certification....................................................................................... 3 2. Test Result Summary ............................................................................... 4 3. EUT Description ........................................................................................ 5 4. General Information .................................................................................. 7 4.1. Test environment and mode ................................................................................. 7 4.2. Description of Support Units ................................................................................ 8 5. Facilities and Accreditations ................................................................... 9 5.1. Facilities ................................................................................................................. 9 5.2. Location ................................................................................................................. 9 5.3. Measurement Uncertainty ..................................................................................... 9 6. Test Results and Measurement Data .................................................... 10 6.1. Antenna requirement .......................................................................................... 10 6.2. Conducted Emission ........................................................................................... 11 6.3. Maximum Conducted (Average) Output Power ................................................ 15 6.4. Emission Bandwidth ........................................................................................... 16 6.5. Power Spectral Density ....................................................................................... 17 6.6. Conducted Band Edge and Spurious Emission Measurement ....................... 18 6.7. Radiated Spurious Emission Measurement ...................................................... 20 Appendix A: Test Result of Conducted Test Appendix B: Photographs of Test Setup Appendix C: Photographs of EUT Report No.: TCT201230E048 Page 3 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 1. Test Certification Product: Wall-mounted 32 inch LCD Signage with Writing-board Model No.: ADMA04W-32 Additional Model No.: N/A Trade Mark: YG displays Applicant: GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. Address: No. 75, Pacific Ind. Zone, Xingtang Town, Zengcheng, Guangzhou, 511340 China Manufacturer: GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. Address: No. 75, Pacific Ind. Zone, Xingtang Town, Zengcheng, Guangzhou, 511340 China Date of Test: Dec. 31, 2020 – Jan. 22, 2021 Applicable Standards: FCC CFR Title 47 Part 15 Subpart C Section 15.247 FCC KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.10:2013 The above equipment has been tested by Shenzhen Tongce Testing Lab. and found compliance with the requirements set forth in the technical standards mentioned above. The results of testing in this report apply only to the product/system, which was tested. Other similar equipment will not necessarily produce the same results due to production tolerance and measurement uncertainties. Tested By: Date: Jan. 22, 2021 Rleo Reviewed By: Date: Jan. 25, 2021 Beryl Zhao Approved By: Date: Jan. 25, 2021 Tomsin Report No.: TCT201230E048 Page 4 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 2. Test Result Summary Requirement CFR 47 Section Result Antenna requirement §15.203/§15.247 (c) PASS AC Power Line Conducted Emission §15.207 PASS Conducted Peak Output Power §15.247 (b)(3) PASS 6dB Emission Bandwidth §15.247 (a)(2) PASS Power Spectral Density §15.247 (e) PASS Band Edge §15.247(d) PASS Spurious Emission §15.205/§15.209 PASS Note: 1. PASS: Test item meets the requirement. 2. Fail: Test item does not meet the requirement. 3. N/A: Test case does not apply to the test object. 4. The test result judgment is decided by the limit of test standard. Report No.: TCT201230E048 Page 5 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 3. EUT Description Product: Wall-mounted 32 inch LCD Signage with Writing-board Model No.: ADMA04W-32 Additional Model No.: N/A Trade Mark: YG displays Operation Frequency: 2412MHz~2462MHz (802.11b/802.11g/802.11n(HT20)) Channel Separation: 5MHz Number of Channel: 11 for 802.11b/802.11g/802.11n(HT20) Modulation Technology: (IEEE 802.11b) Direct Sequence Spread Spectrum (DSSS) Modulation Technology: (IEEE 802.11g/802.11n) Orthogonal Frequency Division Multiplexing(OFDM) Data speed (IEEE 802.11b): 1Mbps, 2Mbps, 5.5Mbps, 11Mbps Data speed (IEEE 802.11g): 6Mbps, 9Mbps, 12Mbps, 18Mbps, 24Mbps, 36Mbps, 48Mbps, 54Mbps Data speed (IEEE 802.11n): Up to 150Mbps Antenna Type: Integral Antenna Antenna Gain: 5dBi…

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Report No.: TCT201230E048 Page 49 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Band edge measurements Test Result Test Mode Antenna Ch Name Channel Ref Level[dBm] Result[dBm] Limit[dBm] Verdict 11B Ant1 Low 2412 1.42 -44.1 <=-28.58 PASS High 2462 -0.31 -48.71 <=-30.31 PASS 11G Ant1 Low 2412 -3.33 -35.84 <=-33.33 PASS High 2462 -0.72 -42.35 <=-30.72 PASS 11N20SISO Ant1 Low 2412 -1.23 -31.84 <=-31.23 PASS High 2462 -1.30 -43.41 <=-31.3 PASS Test Graphs 11B_Ant1_Low_2412 11B_Ant1_High_2462 11G_Ant1_Low_2412 Report No.: TCT201230E048 Page 50 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11G_Ant1_High_2462 11N20SISO_Ant1_Low_2412 11N20SISO_Ant1_High_2462 Report No.: TCT201230E048 Page 51 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT201230E048 Page 52 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Conducted Spurious Emission Test Result Test Mode Antenna Channel Freq Range [Mhz] Ref Level [dBm] Result [dBm] Limit [dBm] Verdict 11B Ant1 2412 Reference 1.38 1.38 --- PASS 30~1000 30~1000 -64.551 <=-28.616 PASS 1000~26500 1000~26500 -43.393 <=-28.616 PASS 2437 Reference 0.79 0.79 --- PASS 30~1000 30~1000 -38.157 <=-29.208 PASS 1000~26500 1000~26500 -43.07 <=-29.208 PASS 2462 Reference -0.36 -0.36 --- PASS 30~1000 30~1000 -64.946 <=-30.357 PASS 1000~26500 1000~26500 -42.331 <=-30.357 PASS 11G Ant1 2412 Reference -3.13 -3.13 --- PASS 30~1000 30~1000 -64.792 <=-33.126 PASS 1000~26500 1000~26500 -43.049 <=-33.126 PASS 2437 Reference 0.00 0.00 --- PASS 30~1000 30~1000 -36.412 <=-29.996 PASS 1000~26500 1000~26500 -42.855 <=-29.996 PASS 2462 Reference -1.60 -1.60 --- PASS 30~1000 30~1000 -65.365 <=-31.602 PASS 1000~26500 1000~26500 -42.889 <=-31.602 PASS 11N20SISO Ant1 2412 Reference -1.61 -1.61 --- PASS 30~1000 30~1000 -62.925 <=-31.608 PASS 1000~26500 1000~26500 -42.217 <=-31.608 PASS 2437 Reference -1.04 -1.04 --- PASS 30~1000 30~1000 -64.794 <=-31.037 PASS 1000~26500 1000~26500 -42.343 <=-31.037 PASS 2462 Reference -1.36 -1.36 --- PASS 30~1000 30~1000 -64.776 <=-31.363 PASS 1000~26500 1000~26500 -42.971 <=-31.363 PASS Report No.: TCT201230E048 Page 53 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Test Graphs 11B_Ant1_2412_0~Reference 11B_Ant1_2412_30~1000 11B_Ant1_2412_1000~26500 Report No.: TCT201230E048 Page 54 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11B_Ant1_2437_0~Reference 11B_Ant1_2437_30~1000 11B_Ant1_2437_1000~26500 11B_Ant1_2462_0~Reference Report No.: TCT201230E048 Page 55 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11B_Ant1_2462_30~1000 11B_Ant1_2462_1000~26500 11G_Ant1_2412_0~Reference Report No.: TCT201230E048 Page 56 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11G_Ant1_2412_30~1000 11G_Ant1_2412_1000~26500 11G_Ant1_2437_0~Reference Report No.: TCT201230E048 Page 57 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11G_Ant1_2437_30~1000 11G_Ant1_2437_1000~26500 11G_Ant1_2462_0~Reference Report No.: TCT201230E048 Page 58 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11G_Ant1_2462_30~1000 11G_Ant1_2462_1000~26500 11N20SISO_Ant1_2412_0~Reference Report No.: TCT201230E048 Page 59 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11N20SISO_Ant1_2412_30~1000 11N20SISO_Ant1_2412_1000~26500 11N20SISO_Ant1_2437_0~Reference Report No.: TCT201230E048 Page 60 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11N20SISO_Ant1_2437_30~1000 11N20SISO_Ant1_2437_1000~26500 11N20SISO_Ant1_2462_0~Reference Report No.: TCT201230E048 Page 61 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11N20SISO_Ant1_2462_30~1000 11N20SISO_Ant1_2462_1000~26500 Report No.: TCT201230E048 Page 62 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Duty Cycle Test Result Test Mode Antenna Channel Transmission Duration [ms] Transmission Period [ms] Duty Cycle [%] Limit Verdict 11B Ant1 2412 8.19 8.23 99.48 --- PASS 2437 8.19 8.22 99.60 --- PASS 2462 8.19 8.22 99.60 --- PASS 11G Ant1 2412 1.36 1.39 97.37 --- PASS 2437 1.36 1.39 97.37 --- PASS 2462 1.36 1.39 97.36 --- PASS 11N20SISO Ant1 2412 1.27 1.31 97.19 --- PASS 2437 1.27 1.31 97.19 --- PASS 2462 1.27 1.31 97.19 --- PASS Test Graphs 11B_Ant1_2412 11B_Ant1_2437 11B_Ant1_2462 Report No.: TCT201230E048 Page 63 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11G_Ant1_2412 11G_Ant1_2437 11G_Ant1_2462 Report No.: TCT201230E048 Page 64 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com 11N20SISO_Ant1_2412 11N20SISO_Ant1_2437 11N20SISO_Ant1_2462 Report No.: TCT201230E048 Page 65 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Report No.: TCT201230E048 Page 66 of 66 Hotline: 400-6611-140 Tel: 86-755-27673339 Fax: 86-755-27673332 http://www.tct-lab.com Appendix B: Photographs of Test Setup Refer to the test report No. TCT201230E012 Appendix C: Photographs of EUT Refer to the test report No. TCT201230E012 *****END OF REPORT*****

Page 1 of 2 Appendix A: Photographs of Test Setup Product: Wall-mounted 32 inch LCD Signage with Writing-board Model: ADMA04W-32 Radiated Emission Page 2 of 2 Conducted Emission