OUECSXCVR2CSXCV Transceiver

Paul C. Buff, Inc. Covered Equipment Certification Attestation Letter 11/28/2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID: OUECSXCVR2 Paul C. Buff, 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. Paul C. Buff, 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 a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Paul C. Buff, Inc. (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Signed: Printed name: Brian Lennon Title: Technical Director Company Name: Paul C. Buff, Inc. Date: 11/28/2025

Paul C. Buff, Inc. * 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 11/28/2025 TO: Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 ATTN.: Reviewing Engineer FCC ID: OUECSXCVR2 FRN of applicant: 0015806235 Per section 2.911(d)(7) of the FCC rules, [ Paul C. Buff, Inc.] (“the applicant”) certifies that the equipment for which authorization is sought is designated to the following U.S. agent* for service of process: Company Name: Paul C. Buff, Inc. FCC Registration Number (FRN): 0015806235 Physical U.S. Company Address: 2725 Bransford Ave., Nashville, Tennessee, United States Contact Person: Brian Lennon 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: Signed: Printed name: Brian Lennon Title: Technical Director Company Name: Paul C. Buff, Inc. Date: 11/28/2025 Agent Signed (if different from Applicant): Signed: Printed name: Brian Lennon Title: Technical Director Company Name: Paul C. Buff, Inc. Date: 11/28/2025

Paul C. Buff, Inc. Request for Long-Term Confidentiality Letter-FCC (2025/11/28) RE: CONFIDENTIALITY REQUEST FOR (EUT NAME: CSXCV Transceiver /MODEL # CSXCV AND FCC ID# OUECSXCVR2) 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 (Schematics, Operational Description, Block Diagrams) required to be submitted with this application be permanently withheld from public review. The documents listed above contain trade secrets that are treated as confidential by us. Substantial competitive harm to us could result should they be made available to the public. Please contact me if there is any information you may need. Sincerely, Signature Printed Name: Brian Lennon Company: Paul C. Buff, Inc. Job Title: Technical Director Email: [email protected] Telephone: 615-383-3982

Paul C. Buff, Inc. Date: 2025-11-28 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 RE: LETTER OF AGENT AUTHORIZATION FCC ID: OUECSXCVR2 To Whom It May Concern: We, the undersigned, hereby authorize Compliance Testing, LLC 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). Signature Printed Name: Brian Lennon Company: Paul C. Buff, Inc. Job Title: Technical Director Email: [email protected] Telephone: 615-383-3982

FCC ID: OUECSXCVR2 External photos FCC ID: OUECSXCVR2 FCC ID: OUECSXCVR2

(r ed outline of CSXCV unit) ar twork to be prin ted in Pantone 877C CSXCV Transceiver FCC ID: OUECSXCVR2 25.45 29.57

FCC ID: OUECSXCVR2 Internal photos FCC ID: OUECSXCVR2 FCC ID: OUECSXCVR2 RF Antenna RF Chip

Report No.: NTC2510459FV00 Dongguan Nore Testing Center Co., Ltd. Address: Room 101, 1101, Building 2, No. 61, Hongmei Section, Wangsha Road, Hongmei Town, Dongguan, Guangdong, People's Republic of China Web: www.ntc-c.com Tel:+86-769-2202 2444 Fax:+86-769-2202 2799 Page 1 of 30 FCC TEST REPORT Applicant......................... : Paul C. Buff, Inc. Address........................... : 2725 Bransford Ave., Nashville, Tennessee, United States Manufacturer,.................... : Paul C. Buff, Inc. Address........................... : 2725 Bransford Ave., Nashville, Tennessee, United States Factory............................ : Mototech Electronics (DG) Co., Ltd Address........................... : No.17 XiangRong Road, SongMuShan Village, DaLang Town, DongGuan, GuangDong, China Product Name.................. : CSXCV Transceiver Brand Name..................... : Model No. ....................... : CSXCV FCC ID............................ OUECSXCVR2 Measurement Standard...... : 47 CFR FCC Part 15, Subpart B, Class B Receipt Date of Samples.... : October 30, 2025 Date of Tested.................. : October 30, 2025 to November 26, 2025 Date of Report.................. : December 03, 2025 This report shows that above equipment is technically compliant with the requirements of the standards above. All test results in this report apply only to the tested sample(s). Without prior written approval of Dongguan Nore Testing Center Co., Ltd., this report shall not be reproduced except in full. Prepared by Jenny Liu / Project Engineer Approved by Iori Fan / Authorized Signatory R eport No.: NTC2510459FV00 Page 2 of 30 Table of Contents 1. Summary of Test Result ....................................................................................................................................... 4 2. General Description of EUT ................................................................................................................................. 5 3. Configuration of EUT ............................................................................................................................................. 7 4. Description of Support Device ............................................................................................................................. 7 5. Test Facility ............................................................................................................................................................. 8 6. Test Conditions ...................................................................................................................................................... 9 7. Measurement Uncertainty .................................................................................................................................... 9 8. Measurement Bandwidths .................................................................................................................................... 9 9. Deviations and Abnormalities from Standard Conditions ................................................................................ 9 10. Sample Calculations ......................................................................................................................................... 10 11. Conducted Emission Measurement ................................................................................................................ 11 12. Radiated Emission Measurement ................................................................................................................... 15 13. Measuring Devices and Test Equipment ....................................................................................................... 22 14. Photographs of Test Configuration ................................................................................................................. 23 15. Photographs of the EUT ................................................................................................................................... 25 Report No.: NTC2510459FV00 Page 3 of 30 Revision History Report Number Description Issued Date NTC2510459FV00 Initial Issue 2025-12-03 Report No.: NTC2510459FV00 Page 4 of 30 1. Summary of Test Result EMISSION Standard Test Clause Test Item Result Remarks 47 CFR FCC Part 15, Subpart B, Class B; ANSI C63.4-2014 §15.107(a) Conducted Emission PASS --- §15.109(a) Radiated Emission PASS --- Report No.: NTC2510459FV00 Page 5 of 30 2. General Description of EUT Product Information Product Name: CSXCV Transceiver Main Model Name: CSXCV Additional Model Name: N/A Model Difference: N/A S/N: 2510-6920 Brand Name: Hardware version: R9 Software version: Not Stated Rating: DC 3.3V, 300mA Classification: Class B Operation Frequency: 2.4GHz RX Typical arrangement: Table-top I/O Port: Refer to the user manual Accessories Information Adapter: N/A Cable: N/A Other: N/A Additional Information Note: N/A Remark: All the information above are provided by the manufacturer. More detailed feature of the EUT please refers to the user manual. Report No.: NTC2510459FV00 Page 6 of 30 Channel list Channel Frequency (MHz) Channel Frequency (MHz) 1 2427 9 2443 2 2429 10 2445 3 2431 11 2447 4 2433 12 2449 5 2435 13 2451 6 2437 14 2453 7 2439 15 2455 8 2441 16 2457 Technical Specification (2.4G RX Function) Frequency Range: 2427-2457MHz Number of Channel: 16 (refer to following channel list for details) Channel Space: 2MHz Antenna Type: PCB Antenna Report No.: NTC2510459FV00 Page 7 of 30 3. Configuration of EUT Description of Test Modes Test Mode Description 1. RX Mode Insert the EUT into auxiliary equipment, and make the EUT pair with the remote control, then make it work at RX mode. Block Diagram of Configuration Note: a. All the equipment/cables were placed in the worst-case configuration to maximize the emission during the test. b. Grounding was established in accordance with the manufacturer’s requirements and conditions for the int ended use. c.…

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FCC ID: OUECSXCVR2 Test Photo Radiated emission (30-1000MHz) Radiated emission (Above 1000MHz) FCC ID: OUECSXCVR2 Conducted Emission