OKUZD0603AI Wireless Mic.

Shenzhen Ju nlan Elect ronic Ltd No.277 PingKui Road, Shijing Community, Pingsh an Office , Pingsh an New Dist rict , Shenzhen China The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC. Federal Communicati ons Commission Authorizati on and Evaluati on Division Equipment Auth oriza ti on Branch 7435 Oakland Mills Road Columbia, MD 21046 Shenzhen Junlan Electronic Ltd [No.277 PingKui Road, sh ijingCommunity, Pingsh an offce, Pingsh an NewDist rict ,] [Shenzhen] [China] FRN: 0021880893 8/5/25 U.S . Agent Designati on [S henzhen Junlan Electr onic Ltd ] acknowledges th eir consent for th e following conta ct located in th e Unite d Sta te s to act as th eir agent fo r service of process fo r th e equipment for which auth orizati on is sought (FCC ID :O KUZD0603 ) Name of U.S . agent:Tim Payne Company U.S . agent:FCC US Agent, LLC Physical U.S . address of agent:3722 Illinoi s Ave nue, Sa int Charles, IL, 60174, FRN of U.S . agent:0033402884 Email address of U.S . agent:Su pport@FCCUSA gent.c om Phone of U.S . agent: FCC US Agent, LLC acknowledges th eir obligati on to accept service of process on behalf of [S henzhen Junlan Electr onic Ltd ]. [S henzhen Junlan Electr onic Ltd ] accepts its obligati on to mainta in an agent for service of process in th e Unite d Sta te s fo r no less th an one year afte r either th e grante e has permanently te rminated all marketi ng and importa tion of th e applicable equipment with in th e U.S ., or th e conclusion of any Commission-relate d administr ati ve or jud icial proceeding involving th e equipment, whichever is late r. By signing th is fo rm, we confirm th e above and th at we are aware of th e applicati on requirements liste d under § 2.9 11(d)(7). Sincerely, Signature PengXiao safetyengineer ShenzhenJunlanElectronicLtd Signature [Tim Payne] [Manager] [FCC US Agent, LLC ] 4 8 _ [ m o d e l ] U S _ A g e n t _ 2 . 9 1 1 ( d ) ( 7 ) - U , V 0 3

Shenzhen Junlan Electronic Ltd (September 29, 2025) 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: OKUZD0603 [Shenzhen Junlan Electronic 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) peng xiao Shenzhen Junlan Electronic Ltd (September 29, 2025) 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: OKUZD0603 [Shenzhen Junlan Electronic 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) peng xiao

Shenzhen Junlan Electronic Ltd (September 29, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (AI Wireless Mic. / ZD-0603 / FCC ID: OKUZD0603 ) 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: peng xiao Title: safety engineer

Shenzhen Junlan Electronic Ltd (September 29, 2025) 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: peng xiao Title: safety engineer

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 3 Model: ZD-0603 External Photos Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 3 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 3

EchoGlow Mic Model No.: ZD-0603 DC: 5V 1000mAH Li-ion Battery: 3.7V 500mAH FCC ID:OKUZD0603 Made in China

Shenzhen CTB Testing Co., Ltd. FCC ID:OKUZD0603 Portable device According to §15.247(e)(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. According to KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR 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 When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. EDR: Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion 2.402 -2.361 0.58 -2±1 -1.00 0.79 <5 0.24622 3.00 YES 2.441 -1.579 0.70 -1±1 0.00 1.00 <5 0.31247 3.00 YES 2.480 -3.102 0.49 -3±1 -2.00 0.63 <5 0.19873 3.00 YES 2.402 -0.236 0.95 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 0.559 1.14 0±1 1.00 1.26 <5 0.39338 3.00 YES 2.480 -1.01 0.79 -1±1 0.00 1.00 <5 0.31496 3.00 YES 2.402 0.276 1.07 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.441 1.03 1.27 1±1 2.00 1.58 <5 0.49524 3.00 YES 2.480 -0.525 0.89 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK π /4DQPSK 8DQPSK Conclusion: For the max result : 0.49524≤ FCC Limit 3.0 for 1g SAR.

V . S .W . R < 1.4 Polarization Type V ertical & Horizontal Frequenc Range2400 ~ 2500GHz Input Impendence(ohm)50 Efficiency (dB) 6 0.2 % 6 0.2 %-3.61.91.2 Maximum Power (dBm)1.7 (XY-plane) Gain (dBi) 1.9dBi Peak EIRP(dBm)1.2 Tot. Rad. Pwr. (dBm)-1.2 (Input pwr – loss pwr) Product specification Q uick Reference Date Ante nna module on the system board Ant. Port Input Pwr. (dBm)0 (Typ. BT class 2 output power) Directivity (dBi)1 (a ll direction antenna) Minim um Power (dBm)-4(XY-plane) Avg. Power (dBm)-0.5(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 G ain Table Unit in dBi @2.44GH zXY-planeXZ-planeYZ-plane Efficiency Peak Avg. Peak Avg. Peak Avg. Module Board -0.51.1-3.0 Return Loss The Environment of Antenna Radiation Pattern 3D radiation pattern diagram XY-planeXZ-planeYZ-plane

Report Tel: 4008-707-283Web: http://www.ctb-lab.net Page 1 of 56 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: AI Wireless Mic. FCC ID: OKUZD0603 Trademark: OTIC Model Number: ZD-0603 Prepared For: Shenzhen Junlan Electronic Ltd Address: No. 277, Pingkui Road, Shijing Community, Pingshan Office, Pingshan New District, Shenzhen, China Manufacturer: Shenzhen Junlan Electronic Ltd Address: No. 277, Pingkui Road, Shijing Community, Pingshan Office, Pingshan New District, Shenzhen, 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: Jul. 10, 2025 Sample tested Date: Jul. 10, 2025 to Jul. 01, 2025 Issue Date: Jul. 01, 2025 Report No.: CTB25071007302RF01 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2020 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25071007302RF01 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 56 TABLE OF CONTENT Test Report Declaration Page 1. VERSION ........................................................................................................................................................ 4 2. TEST SUMMARY .......................................................................................................................................... 5 3. MEASUREMENT UNCERTAINTY............................................................................................................. 6 4. PRODUCT INFORMATION AND TEST SETUP ..................................................................................... 7 4.1 Product Information .................................................................................................................................................... 7 4.2 Test Setup Configuration .......................................................................................................................................... 7 4.3 Support Equipment ..................................................................................................................................................... 7 4.4 Channel List .................................................................................................................................................................. 8 4.5 Test Mode ...................................................................................................................................................................... 8 4.6 Test Environment ........................................................................................................................................................ 8 5. TEST FACILITY AND TEST INSTRUMENT USED ................................................................................ 9 5.1 Test Facility ................................................................................................................................................................... 9 5.2 Test Instrument Used ................................................................................................................................................. 9 6. AC POWER LINE CONDUCTED EMISSION .......................................................................................... 12 6.1 Block Diagram Of Test Setup ................................................................................................................................ 12 6.2 Limit ............................................................................................................................................................................... 12 6.3 Test procedure ........................................................................................................................................................... 12 6.4 Test Result .................................................................................................................................................................. 14 7. RADIATED SPURIOUS EMISSION ........................................................................................................ 16 7.1 Block Diagram Of Test Setup ................................................................................................................................ 16 7.2 Limit ............................................................................................................................................................................... 16 7.3 Test procedure ........................................................................................................................................................... 17 7.4 Test Result .................................................................................................................................................................. 18 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS..................................................... 27 8.1 Block Diagram Of Test Setup ................................................................................................................................ 27 8.2 Limit ...........................................................…

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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: ZD-0603 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