ZHK-KB25TXTransceiver

* the applicant must designate a contact located in the United States for purposes of acting as the applicant’s agent for service of process, regardless of whether the applicant is a domestic or foreign entity. An applicant located in the United States may designate itself as the agent for service of process. U.S. Agent Designation for Service of Process - Certification Attestation Letter 4/23/2024 Nemko North America, Inc. 303 River Road Ottawa K1V 1H2 Canada ATTN.: Reviewing Engineer FCC ID: ZHK-KB25; ZHK-KB25TX Per section 2.911(d)(7) of the FCC rules, GN Audio USA Inc. (“the applicant”) certifies that the equipment for which authorization is sought is designated to the following U.S. Designated agent* for service of process: FRN: 0033478405 Company Name: GN Audio USA Inc. Physical U.S. Company Address: 900 Chelmsford Street, Tower II, 8th Floor, Lowell, MA 01851, USA Agent name: Chirky Lin Agent Email Address: [email protected] The above contact person accepts the obligation for service of process. The applicant 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. Applicant Signed: Designated Agent Signed: (Required, if different to Applicant): Signed: Signed: Printed name: Chirky Lin Printed name: Click here to enter text. Title: SENIOR REGULATORY MANAGER Title: Click here to enter text. Company Name: GN Audio USA Inc. Company Name: Click here to enter text. Date: 4/23/2024 Date: Click here to enter a date.

Covered Equipment Certification Attestation Letter 4/23/2024 Nemko North America, Inc. 303 River Road Ottawa K1V 1H2 Canada ATTN.: Reviewing Engineer FCC ID: ZHK-KB25TX GN Audio USA Inc. (“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. Note: If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, the applicant should include an explanation on why the equipment is not “covered” equipment. GN Audio USA Inc. (“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. Signed: Printed name: Chirky Lin Title: Senior Regulatory Manager Company Name: GN Audio USA Inc. Date: 4/23/2024

ATE : 2024-4-23 FCC ID: ZHK-KB25TX Dear Sir I hereby have entrusted the following person to be a proxy regarding application for Type Certification. Company name: Cerpass Technology Corporation Address: No.10, Lane 2, Lianfu Street, Luzhu Dist., Taoyuan City, 33848, Taiwan(R.O.C.) Name: Nina Hsu For instances where our authorized agent signs the application for certification on our behalf, I acknowledge that all responsibility for complying with the terms and conditions for certification, as specified by Nemko Canada Inc, still resides with us. Signature FCC grantee contact person information. Name/Title: Chirky Lin / SENIOR REGULATORY MANAGER Company Name: GN Audio USA Inc. Address: 900 Chelmsford Street, Tower II, 8th Floor, Lowell, MA 01851, USA TEL: +886-2-8227-1999# 334 FAX: +886-2-8227-1050 Email: [email protected] 900 Chelmsford Street, Tower II, 8th Floor, Lowell, MA 01851, USA

June 12, 2024 Nemko North America, Inc. 303 River Road Ottawa, Ontario, Canada K1V 1H2 REQUEST FOR CONFIDENTIALITY - FCC FCC ID: ZHK-KB25TX Pursuant to Sections 0.457(d) and 0.459 of the Commission’s Rules and FCC Guidance document 726920, we hereby request permanent confidential treatment of exhibits identified as such in the table below and request they are permanently withheld from public review based on the documents containing trade secrets and proprietary information not customarily released to the public. The public disclosure of this information might be harmful to the applicant and provide unjustified benefits to its competitors. We also request short-term confidentiality on certain exhibits until the intended date of marketing as outlined below. We request the exhibits be withheld from public view for a period of 180 days days. We attest marketing of the product will only commence after the period of short-term confidentiality expires, or if marketing is to commence before the requested number of days listed above, the grantee will inform Nemko to release the Short-Term Confidentiality information withheld on the FCC equipment authorization website. Exhibit Type of Confidentiality Requested Block Diagrams ☒ Permanent ☐ Short Term External Photos ------------------ ☒ Short Term Internal Photos ☐ Permanent* ☒ Short Term Operation Description ☒ Permanent ☐ Short Term Parts List & Placement/BOM ☐ Permanent ☐ Short Term Tune-Up Procedure ☐ Permanent ☐ Short Term Schematic Diagrams ☒ Permanent ☐ Short Term Test Setup Photos ------------------ ☒ Short Term User’s Manual ☐ Permanent* ☒ Short Term The asterisked items (*) require further information to be provided in this justification letter before permanent confidentiality will be extended to these exhibits. Please refer to FCC KDB 726920 D01 found at: https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=41731 and review section II, 3) regarding specific information that must accompany these requests. Note: any documents held under the Short-Term confidentiality will automatically become public after the requested time if an appropriate extension request has not been received. Any exhibits (i.e., schematic diagrams) that may have already been requested to have “Permanent” confidentiality as shown above need not be repeated under Short-Term confidentiality request. Sincerely, Signed: Printed name: Chirky Lin Title: Senior Regulatory Manager Company Name: GN Audio USA Inc.

Label & location Rear Side of EUT

CERPASS TECHNOLOGY CORP. Report No.: 24030398-TRFCC03 Cerpass Technology Corp. Issued Date : May. 31, 2024 T-FD-506-0 Ver 1.6 Page No. : 44 of 46 FCC ID. : ZHK-KB25TX 12. Radio Frequency Exposure 12.1 Applicable Standards §1.1307(b)(3)(i)(A) The available maximum time-averaged power is no more than 1 mW, regardless of separation distance. §1.1307(b)(3)(i)(c) ERP is below a threshold calculated based on the distance , R between the person and the antenna / radiating structure, where R > λ / 2 π. § 1.1307(b)(3)(i)(B). Device operates between 300 MHz and 6 GHz and the maximum time-averaged power or effective radiated power (ERP), whichever is greater, <= Pth CERPASS TECHNOLOGY CORP. Report No.: 24030398-TRFCC03 Cerpass Technology Corp. Issued Date : May. 31, 2024 T-FD-506-0 Ver 1.6 Page No. : 45 of 46 FCC ID. : ZHK-KB25TX 12.2 EUT Specification Frequency band (Operating) 2402MHz-2480MHz Device category Portable (<20cm separation) Mobile (>20cm separation) Antenna diversity Single antenna Multiple antennas Tx diversity Rx diversity Tx/Rx diversity Evaluation applied Blanket 1 mW Blanket Exemption MPE-based Exemption SAR-based Exemption Remark: The maximum conducted output power is -0.5dBm (0.891mW) at 2402MHz (with 4.5dBi antenna gain.) CERPASS TECHNOLOGY CORP. Report No.: 24030398-TRFCC03 Cerpass Technology Corp. Issued Date : May. 31, 2024 T-FD-506-0 Ver 1.6 Page No. : 46 of 46 FCC ID. : ZHK-KB25TX 12.3 Result Channel Frequency (MHz) Max. Conducted output power (dBm) Max. Tune up power (dBm) Max. Tune up power (mW) Antenna Gain(dBi) Max.Tune up e.i.r.p. Power (dBm) Max.Tune up e.r.p. Power (dBm) Max.Tune up e.r.p. Power (mW) Distance (mm) SAR test exclusion thresholds (mW) 2402-2480 -0.50 0.00 1.00 4.50 4.50 2.35 1.72 5 2.72 No non-compliance noted. ----------THE END OF REPORT----------

ClientDate2024/2/27 ProductTested byCarl Frequency Efficiency(d B) Efficiency(%)Peak Gain 2400.00 -5.6827.024.39 2402.00 -5.7326.704.25 2405.00 -5.8426.033.96 2410.00 -5.8825.833.63 2415.00 -5.9825.243.35 2420.00 -6.0025.153.20 2425.00 -5.9925.153.13 2430.00 -5.9125.643.15 2435.00 -5.8126.253.24 2440.00 -5.7326.753.42 2441.00 -5.7126.883.44 2445.00 -5.5827.653.66 2450.00 -5.4128.753.93 2455.00 -5.2529.854.24 2460.00 -5.0431.354.49 2465.00 -4.9831.774.50 2470.00 -4.8532.764.44 2475.00 -4.8432.844.18 2480.00 -4.9631.923.63 2485.00 -5.2130.143.02 2490.00 -5.2629.762.61 2495.00 -5.3529.182.23 2500.00 -5.4428.561.71 RG100 only Gtech Dongle 2402MHz2441 MHz2480 MHz Y X Z

CERPASS TECHNOLOGY CORP. Report No.: 24030398-TRFCC03 Cerpass Technology Corp. Issued Date : May. 31, 2024 T-FD-506-0 Ver 1.6 Page No. : 1 of 46 FCC ID. : ZHK-KB25TX FCC RADIO TEST REPORT Applicant : GN Audio USA Inc. Address : 900 Chelmsford Street, Tower II, 8th Floor, Lowell, MA 01851, USA Equipment : Transceiver Model No. : KB25TX Trade Name : FCC ID : ZHK-KB25TX I HEREBY CERTIFY THAT : The sample was received on Apr. 16, 2024 and the testing was completed on May. 14, 2024 at Cerpass Technology Corp. The test result refers exclusively to the test presented test model / sample. Without written approval of Cerpass Technology Corp., the test report shall not be reproduced except in full. Approved by: Mark Liao / Supervisor Laboratory Accreditation: Cerpass Technology Corporation Test Laboratory CERPASS TECHNOLOGY CORP. Report No.: 24030398-TRFCC03 Cerpass Technology Corp. Issued Date : May. 31, 2024 T-FD-506-0 Ver 1.6 Page No. : 2 of 46 FCC ID. : ZHK-KB25TX CONTENTS 1. Summary of Test Procedure and Test Results ................................................................................ 5 1.1 Applicable Standards ................................................................................................................. 5 2. Test Configuration of Equipment under Test ................................................................................... 6 2.1 Feature of Equipment under Test ............................................................................................... 6 2.2 Carrier Frequency of Channels .................................................................................................. 7 2.3 Test Mode and Test Software ..................................................................................................... 8 2.4 Description of Test System ......................................................................................................... 9 2.5 General Information of Test ...................................................................................................... 10 2.6 Measurement Uncertainty ........................................................................................................ 10 3. Test Equipment and Ancillaries Used for Tests ............................................................................. 11 4. Antenna Requirements ..................................................................................................................... 13 4.1 Standard Applicable ................................................................................................................. 13 4.2 Antenna Construction and Directional Gain ............................................................................. 13 5. Test of AC Power Line Conducted Emission ................................................................................. 14 5.1 Test Limit .................................................................................................................................. 14 5.2 Test Procedures ....................................................................................................................... 14 5.3 Typical Test Setup .................................................................................................................... 15 5.4 Test Result and Data ................................................................................................................ 16 5.5 Test Photographs ..................................................................................................................... 18 6. Test of Spurious Emission (Radiated) ............................................................................................ 19 6.1 Test Limit .................................................................................................................................. 19 6.2 Test Procedures ....................................................................................................................... 20 6.3 Typical Test Setup .................................................................................................................... 21 6.4 Test Result and Data (9kHz ~ 30MHz)..................................................................................... 22 6.5 Test Result and Data (30MHz ~ 1GHz) ................................................................................... 22 6.6 Test Result and Data (1GHz ~ 25GHz) .................................................................................... 24 6.7 Restricted Bands of Operation ................................................................................................. 30 6.8 Test Photographs (30MHz ~ 1GHz) ......................................................................................... 31 6.9 Test Photographs (1GHz ~ 25GHz) ......................................................................................... 32 7. Test of Spurious Emission (Conducted)......................................................................................... 34 7.1 Test Limit .................................................................................................................................. 34 7.2 Test Procedure ......................................................................................................................... 34 7.3 Test Setup Layout .................................................................................................................... 34 7.4 Test Result and Data ................................................................................................................ 34 8. On Time, Duty Cycle and Measurement methods ......................................................................... 37 8.1 Test Limit .................................................................................................................................. 37 8.2 Test Procedure ............................................................…

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