2ARMK-ADA03H443-Inch Outdoor Battery-powered LCD Signage

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(GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD.) (September 12, 2023) 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: 2ARMK-ADA03H4) [GUANGZHOU YOUGUANG OPTOELECTRONICS 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) CHUNG MING LIU (GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD.) (September 12, 2023) 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: 2ARMK-ADA03H4) [GUANGZHOU YOUGUANG OPTOELECTRONICS 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) CHUNG MING LIU

Attestation Statements (September 13, 2023) TO: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046, USA RE: Attestation Statements Part 2.911(d)(7) request f or (FCC ID: 2ARMK-ADA03H4) (GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD.), the undersigned, hereby authorize (D2G Group LLC) to act as our designated U.S. agent for service of process, (GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD.) accepts to maintain an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. (D2G Group LLC) accepts the responsibility to act as designated U.S. agent for service of process, provides an agent for no less than one year after the grantee has terminated all marketing and importation or the conclusion of any Commission-related proceeding involving the equipment. Applicant Information： Company name: GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. Contact Name: CHUNG MING LIU Address: No.75, Pacific Ind. Zone, Xingtang Town, Zengcheng, Guangzhou, 511340 China Telephone No: 13538214502 Email: [email protected] U.S. Agent Information: Company Name: D2G Group LLC Address: 81 Commerce Drive, Fall River, Massachusetts 02720, United States Contact Name: Rod Washington Telephone No: 5086897117 Email: [email protected] FRN: 0028157329 Applicant Signature: Agent Signature: Applicant printed name: CHUNG MING LIU Agent printed name: Rod Washington

GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. Model Difference Data：September 12, 2023 Product description: 43-Inch Outdoor Battery-powered LCD Signage Model name: ADA03H4, ADA03H Trade Name: N/A FCC ID: 2ARMK-ADA03H4 All the model are the same circuit and RF module, except model names . Regards Sincerely Client’s signature : Client’s name / title : CHUNG MING LIU（General manager） Contact information / address：No.75, Pacific Ind. Zone, Xingtang Town, Zengcheng, Guangzhou, 511340 China

GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. (September 12, 2023) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (43-Inch Outdoor Battery-powered LCD Signage / ADA03H4, ADA03H / FCC ID: 2ARMK-ADA03H4) 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: CHUNG MING LIU Title: General manager

GUANGZHOU YOUGUANG OPTOELECTRONICS CO., LTD. (September 12, 2023) 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: CHUNG MING LIU Title: General manager

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FCC §15.247 (i), §2.1091 – RF Exposure FCC ID: 2ARMK-ADA03H4 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 2.4G WIFI 802.11b&2 437 14±1 15 31.6228 1.6032 (2.05dBi) 0.0101 1 Pass EDR 8DPSK &HCH 1±1 2 1.5849 1.6032 (2.05dBi) 0.0005 1 Pass

2.4G RO D ANTENNA TECHNICALDATASHEET TX2400-JK-11RP VERSION：3. 3 DAT E： 202 1-08 -03 TEL ：028-61542639WEBSITE：WWW.ZIISOR.COM CHENGDUZIISORTECHNOLOGYCO., LTD . EXPERTOF IOT ANTENNA Copyright@ChengduZiisorTechnologyCo.,Ltd2020Expert of IoT Antenna TX2400-JK-11RP NO.MECHANICAL SPECIFICATIONSVALUECOMMENT 01Part Number TX2400-JK-11RP 2.4G Rod Antenna 02MaterialTPEE 03Material of RadiatorCopper 04Connector TypeRP SMA Male 05Antenna ColourBlack 06Cable TypeN/A 07Cable LengthN/A 08Weight3g±1g NO.ELECTRICAL SPECIFICATIONSVALUECOMMENT 01Frequency2.4GHz2400~2500MHz 02Antenna Gain2.05dBi 03Radiation typeOmnidirectional 04PolarizationLinearVertical 05Nominal Impedance50Ω 06Power Capacity10W 07S.W.R.≤1.5 NO.ENVIRONMENTAL SPECIFICATIONSVALUECOMMENT 01Operation Temperature-30°C～+75°C 02Storage Temperature-30°C～+75°C 03RoHS CompliantYES TX2400-JK-11RP Copyright@ChengduZiisor TechnologyCo., Ltd 2020Expertof IoT Antenna S.W.R. SMITH TX2400-JK-11RP Copyright@ChengduZiisor TechnologyCo., Ltd 2020Expertof IoT Antenna EFFICIENCY/GAINTEST No. Frequency Hz Efficiency % Gain dBi 012400M70.622. 17 022410M70.791.98 032420M72.952. 05 042430M70.631.77 052440M71.991.50 062450M71.071.67 072460M71.531.95 082470M69.502. 01 092480M69.021.81 102490M70.791.87 112500M68.442. 32 RADIATIONPATTERN 2400MHz 2450MHz 2500MHz TX2400-JK-11RP Copyright@ChengduZiisor TechnologyCo., Ltd 2020Expertof IoT Antenna DISCLAIMER In orderto provideour userswith betterservice,ChengduZiisorTechnologyCo., Ltd (hereinafter referredto as ziisor)will try to presentas detailedand accurateproductinformationas possiblein this manual.However,due to the timelinessof the manualcontent,ziisor shall not absolutelyguarantee the unlimitedtimelinessand applicabilityof the file. Ziisorhas the right to updatethe manualcontent withoutfurthernotice.To get the latesteditioninformation,pls visit the officialwebsiteof ziisor or contactour customerservicestaff. Thanksfor your trust and support! CONTACTUS CompanyNameChengduZiisor TechnologyCo., Ltd Telephone+86- 028-61542639 Websitewww.ziisor.com Sales [email protected] [email protected] CompanyAddress B5 MoldingTool IndustryPark, No. 199 XiQu Avenue, Chengdu,China

Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB230809010RFX Report Tel: 4008-707-283Web: http://www.ctb-lab.net Page 1 of 63 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: 43-Inch Outdoor Battery-powered LCD Signage FCC ID: 2ARMK-ADA03H4 Trademark: N/A Model Number: ADA03H4, ADA03H Prepared For: 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 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: Aug. 03, 2023 Sample tested Date: Aug. 03, 2023 to Aug. 09, 2023 Issue Date: Aug. 09, 2023 Report No.: CTB230809010RFX Test Standards FCC Part15.247 ANSI C63.10:2013 Test Results PASS Remark: This is WIFI-2.4GHz band radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB230809010RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 63 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 ................................................................................ 15 7.3 Test procedure ....................................................................... 16 7.4 Test Result .......................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS .......................... 39 8.1 Block Diagram Of Test Setup .......................................................... 39 8.2 Limit ................................................................................ 39 8.3 Test procedure ....................................................................... 39 8.4 Test Result .......................................................................... 40 9. COUDUCTED OUTPUT POWER ..................................................... 47 9.1 Block Diagram Of Test Setup .......................................................... 47 9.2 Limit ................................................................................ 47 9.3 Test procedure ....................................................................... 47 9.4 Test Result .......................................................................... 48 10. 6DB OCCUPIED BANDWIDTH ....................................................... 49 10.1 Block Diagram Of Test Setup ......................................................... 49 10.2 Limit ............................................................................... 49 10.3 Test procedure ...................................................................... 49 10.4 Test Result ......................................................................... 50 11. POWER SPECTRAL DENSITY ...................................................... 55 11.1 Block Diagram Of Test Setup ......................................................... 55 11.2 Limit ............................................................................... 55 11.3 Test procedure ...................................................................... 55 11.4 Test Result ......................................................................... 56 12. ANTENNA REQUIREMENT ......................................................... 61 13. EUT TEST SETUP PHOTOGRAPHS .................................................. …

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Radiated Emission Below 1G Above 1G Conducted emissions