2BUP4-CERAMICSULTRAwireless headphones

TCB CALL página 1 File FCC ID: 2BUP4-CERAMICSULTRA Please upload an exhibit that explains how does the TCB verify the new agent information: 1- Is the address of the agent a valid physical US mailing address (not a US post office box, not a virtual mailbox, not P.O. Boxes, not a vacant lot, not a public building, etc.) ○ We have checked if the address exists in a real and potential building (Google maps) + official US register, after this verification and the evidence below we can guarantee the following: not a US post office box not a virtual mailbox not P.O. Boxes not a vacant lot not a public building(note) ► We checked the FCC FRN Search based on the information provided by the grantee. On the official register from : Search | California Secretary of State TCB CALL página 2 TCB CALL página 3 TCB CALL página 4 TCB CALL página 5 TCB CALL página 6 TCB CALL página 7 TCB CALL página 8 ► CONCLUSION by TCB: The ASOP defined and provided by grantee is VALID and confirmed. Therefore the exhibit "C5266091_X23_Ed1_US_Agent_Letter" included in the file is ok. 2- Is the agent physically located at that valid US address such that the agent can be legally served at that address? Yes , check above 3- Has the listed agent clearly agreed in writing to serve as the agent for the grantee at that address? Yes, it is included in the exhibit "C5266091_X23_Ed1_US_Agent_Letter" >

1/1 US Agent for Service of Process LETTER OF ATTESTATION TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process: Company Name: Herland International Trading Inc FRN: 0036324101 Contact Name: Jianfeng Gao Address: 1370 Valley Vista Dr Ste 200 Diamond Bar California 91765-3921 Telephone No: 001-909-772-1888 Email: [email protected] Applicant: Company name: Chengdu ROSESELSA Technology Co., Ltd. Product Description: wireless headphones Grantee code: 2BUP4 FCC ID: 2BUP4-CERAMICSULTRA FRN: 0037952363 Contact Name: Henry Chan Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Telephone No: 13760447068 Email: [email protected] [Chengdu ROSESELSA Technology Co., Ltd.] certifies that, as of the date of this filing of the application with the TCB, [Herland International Trading Inc] is our designated US agent for service of process for the above referenced FCC ID. [Chengdu ROSESELSA Technology 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 equipment. [Herland International Trading Inc] accepts, as of the date of the filing of the application, the obligation of the designated US agent for service of process for the above reference FCC ID. The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause § 2.911. Date: 2026/08/05 Applicant’s Name: Henry Chan US Agent’s Name: Jianfeng Gao Title: Manager Title: Manager Signature Signature

Attestation Statement. Old Code: C5266091 24 New Code: 00015544 Ed.3 Change reason: FRN is added to the Applicant information section. 1/1 Chengdu ROSESELSA Technology Co., Ltd. TO: Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 The Commission adopted rules that prohibit equipment authorization for “covered” telecommunications equipment and video surveillance equipment produced by entities identified on the Commission’s Covered List 1 , which is periodically updated. See the Covered List for more details. This Attestation Statement is to confirm that we follow the Section 2.911(d)(5)(i)-(ii) Applicant Company name: Chengdu ROSESELSA Technology Co., Ltd. Grantee code: 2BUP4 FCC ID: 2BUP4-CERAMICSULTRA FRN: 0037952363 Contact Name: Henry Chan Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Telephone No: 13760447068 Fax No: 0755-26509195 Email: [email protected] i. [Chengdu ROSESELSA Technology 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. The applicant must sign this certification. ii. [Chengdu ROSESELSA Technology Co., Ltd.] (“the applicant”) certifies that, as of the date of the filing of the application, the applicant [is not] (as a specifically named entity or any of its subsidiaries or affiliates) identified on the Covered List as an entity producing “covered” equipment. The applicant must sign this certification. [Chengdu ROSESELSA Technology 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 . Date: 2026/08/05 Applicant’s Name: Henry Chan Title: Manager Signature: 1 The Commission’s Covered List is published by the Public Safety and Homeland Security Bureau and posted on the Commission’s website. This Covered List, which is periodically updated, identifies particular equipment, produced by particular entities, that constitutes “covered” equipment. https://www.fcc.gov/supplychain/coveredlist

Chengdu ROSESELSA Technology Co., Ltd. Code 00018768 Ed. 1 Item 1. The device is able to install software/program installation? ☐ Yes, go to Item 2. ☒ No. In this case, the rest of the items do not apply. The device cannot support installation of Kaspersky cybersecurity or anti-virus software. Item 2. Technical Requirements for Kaspersky Cybersecurity Software: # General Requirements (For all Devices) Yes / No or N/A Comments 1 Internet connection for activation and updates (For all Operating Systems) N/A Device wireless headphones Company name Chengdu ROSESELSA Technology Co., Ltd. Grantee code 2BUP4 FCC ID 2BUP4-CERAMICSULTRA FRN 0037952363 Contact name Henry Chan Address Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Telephone number 13760447068 E-mail [email protected] Chipset/module information WQ7034AX Operating System (if applicable) N/A Storage Capacity (hard drive or other permanent memory storage, if applicable) N/A 2 # General Requirements (For Windows Devices) Yes / No or N/A Comments 1 Storage: 1500 MB free space on the hard drive N/A 2 Operating System: Microsoft Windows 8, 8.1, 10 & 11 Home / Pro / Enterprise Microsoft Windows 7 Starter / Home Basic & Premium / Professional / Ultimate SP1 or higher N/A 3 Processor: 1 GHz or higher (x86 or x64) N/A 4 Memory (RAM)1 GB (32-bit) or 2 GB (64-bit) N/A 5 Screen Resolution: Minimum resolution of 1024 x 768 N/A # General Requirements (For macOS devices) Yes / No or N/A Comments 1 Operating System macOS® 13 – 14 N/A 2 Memory (RAM)4 GB N/A 3 Storage: 3455 MB free space on the hard drive N/A # General Requirements (For Android Devices) Yes / No or N/A Comments 1 Storage: 150 MB free space N/A 2 Operating System: Android™ 10 – 14 N/A 3 Screen Resolution: Minimum resolution of 320 x 480 N/A # General Requirements (for iOS devices) Yes / No or N/A Comments 1 Storage: 150 MB free space N/A 2 Operating System: iOS® 17 N/A # General Requirements (For Linux system) Yes / No or N/A Comments 3 1 Hard drive: 1 GB of free space N/A 2 CPU: Intel Pentium 1 GHz or higher N/A 3 RAM: 1 GB N/A 4 Minimum software requirements: AlmaLinux OS 8 or later; AlterOS 7.5 or later; Astra Linux Common Edition 2.12 or later; CentOS 6.7 or later; Debian GNU/Linux 10.0 or later; EulerOS 2.0 or later; Oracle Linux 7.3 or later ; Red Hat Enterprise Linux 6.7 or later ; Rocky Linux 8.5 or later ; SUSE Linux Enterprise Server 12.5 or later; Ubuntu 12.04 or later ; Uncom OS Home / Business / Education / Enterprise 2.2 or later; ALT Linux Workstaton / Workstation K / Server / Education 8 or later; ROSA Linux Workstation / Server 12 or later ; RED OS 7.3 and later ; N/A After reviewed the technical requirements, is the device capable of supporting the installation of Kaspersky software? ☐ Yes, go to Item 3. ☒ No. In this case, the rest of the items do not apply. The device cannot support installation of Kaspersky software Item 3. Connectivity Capabilities: 4 # Physical Interface Purpose Justification 1 1 # Wireless Interface Purpose Justification 1 1 After the review of this items, the device: ☒ Cannot support installation of any cybersecurity or anti-virus software on the covered list. ☐ Potentially can operate with any cybersecurity or anti-virus software on the covered list – additional third- party proof is provided to demonstrate compliance with requirements as of 2.911(d)5(i),(ii) – “Proof of Compliance with Covered List Software Requirements” of this document applies Signature: Name: Henry Chan Date:2026-08-05 1 The justification field is used to justify why the software cannot be received through that interface. Check the annex for more indications.

Chengdu ROSESELSA Technology Co., Ltd. FCC ID: 2BUP4-CERAMICSULTRA Product Similarity Declaration Applicant: Chengdu ROSESELSA Technology Co., Ltd. Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Manufacturer: Chengdu ROSESELSA Technology Co., Ltd. Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Product Name: wireless headphones Trade Mark: ROSESELSA Model Number: CERAMICS ULTRA, CERAMICS ULTRA 2 We (Chengdu ROSESELSA Technology Co., Ltd.) hereby state that all the models are electrical identical including the same software parameter and hardware design (i.e., circuit design, PCB Layout, RF module/circuit, antenna type(s) and antenna location, components on PCB, etc.,), same mechanical structure and design (including product enclosure, materials, etc.,), All models are same as the samples except model name and color, they have the same structure and circuit. <Signature>: Name: Henry Chan Title: Manager Company: Chengdu ROSESELSA Technology Co., Ltd.

C5266091_X10_Ed.2 1/1 Chengdu ROSESELSA Technology Co., Ltd. Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Date: 2026.08.05 Subject: Request for Confidentiality FCC ID: 2BUP4-CERAMICSULTRA To Whom It May Concern, Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules (47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. 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 NOTE 1: Long-Term Confidentiality may be permitted under special conditions (See II. LONG-TERM CONFIDENTIALITY, Section 3 of KDB 726920, use last in force) NOTE 2: Short-Term Confidentiality can be requested for a maximum of 180 days from the date of the grant. 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. In case of short-term Confidentiality, the applicant requests the exhibits selected above are withheld from public view for a period of ______ days from the date of the Grant of Equipment Authorization and prior to marketing. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. Sincerely, C5266091_X10_Ed.2 1/1 Signature: Name: Henry Chan Title: Manager 2026.08. 05

C5266091_X8_Ed.1 1/1 Letter of Authorization Chengdu ROSESELSA Technology Co., Ltd. Company: Chengdu ROSESELSA Technology Co., Ltd. Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Product Name: wireless headphones Model Number: CERAMICS ULTRA, CERAMICS ULTRA 2 FCC Identifier: 2BUP4-CERAMICSULTRA We authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, to act on our behalf on all matters concerning the above named equipment. Any individual within LGAI Technological Center S.A. is authorized to act on our behalf and take action on the application. We declare that authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by LGAI Technological Center S.A. on our behalf shall have the same effect as acts of our own. Name: Henry Chan Date: 2026.08.05 Title: Manager Signature of applicant:

Shenzhen DL Testing Technology Co., Ltd. EUT PHOTO(External Photos) Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. ※※※※※ END OF REPORT ※※※※※

Size: 12*5mm FCC ID: 2BUP4-CERAMICSULTRA Label location

Shenzhen DL Testing Technology Co., Ltd. EUT PHOTO(Internal Photos) ANT(L) ANT(R) Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. ※※※※※ END OF REPORT ※※※※※

FCC ID: 2BUP4-CERAMICSULTRA RF Exposure Evaluation According to KDB 447498 D01 V06 and part 2.1093，Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(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 EIRP=E Meas +20log(d Meas )-104.7 EIRP is the equivalent isotropically radiated power, in dBm E Meas is the field strength of the emission at the measurement distance, in dBμV/m d Meas is the measurement distance, in m Here, BT Conducted power (dBm) Max tune-up (Mw) Frequency (MHz) Min. distance(mm) Calc. thresholds limit 2.8 1.91 2402 5 0.59 3.0 So a SAR test is not required

Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260724006R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 1 of 35 FCC Part 15C Test Report FCC ID: 2BUP4-CERAMICSULTRA Applicant: Chengdu ROSESELSA Technology Co., Ltd. Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Manufacturer: Chengdu ROSESELSA Technology Co., Ltd. Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Product Name: wireless headphones Trade Mark: ROSESELSA Model Number: CERAMICS ULTRA, CERAMICS ULTRA 2 Date of Receipt: Jul. 24, 2026 Test Date: Jul. 24, 2026 – Aug. 04, 2026 Date of Report: Aug. 04, 2026 Prepared By: Shenzhen DL Testing Technology Co., Ltd. Address: 101-201, Comprehensive Building, Tongzhou Electronics Longgang Factory Area, No.1 Baolong Fifth Road, Baolong Community, Baolong Street, Longgang District, Shenzhen, China Applicable Standards: FCC PART 15 C 15.247 ANSI C63.10-2020 + Cor. 1-2023+C63.10a-2024 + Errata to C63.10a-2024 Test Result: Pass Report Number: DLE-260724006R Prepared (Test Engineer): Ken Tan Reviewer (Supervisor): Jack Bu Approved (Manager): Jade Yang This test report is based on a single evaluation of one sample of above mentioned products. It is not permitted to be duplicated in extracts without written approval of Shenzhen DL Testing Technology Co., Ltd. Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260724006R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 2 of 35 Table of Contents Page 1 . SUMMARY OF TEST RESULTS 4 1.1 MEASUREMENT UNCERTAINTY 4 2 . GENERAL INFORMATION 5 2.1 GENERAL DESCRIPTION OF EUT 5 2.2 DESCRIPTION OF TEST MODES 6 2.3 BLOCK DIGRAM SHOWING THE CONFIGURATION OF SYSTEM TESTED 6 2.4 DESCRIPTION OF SUPPORT UNITS(CONDUCTED MODE) 7 2.5 TABLE OF PARAMETERS OF TEST SOFTWARE SETTING 7 2.6 EQUIPMENTS LIST FOR ALL TEST ITEMS 8 3 . EMC EMISSION TEST 9 3.1 CONDUCTED EMISSION MEASUREMENT 9 3.1.1 POWER LINE CONDUCTED EMISSION LIMITS 9 3.1.2 TEST PROCEDURE 9 3.1.3 DEVIATION FROM TEST STANDARD 9 3.1.4 TEST SETUP 10 3.1.5 EUT OPERATING CONDITIONS 10 3.1.6 TEST RESULTS 11 3.2 RADIATED EMISSION MEASUREMENT 13 3.2.1 RADIATED EMISSION LIMITS 13 3.2.2 TEST PROCEDURE 14 3.2.3 DEVIATION FROM TEST STANDARD 14 3.2.4 TEST SETUP 14 3.2.5 EUT OPERATING CONDITIONS 15 3.2.6 TEST RESULTS (BETWEEN 9KHZ – 30 MHZ) 16 3.2.7 TEST RESULTS (BETWEEN 30MHZ – 1GHZ) 17 3.2.8 TEST RESULTS (1GHZ~25GHZ) 21 3.3 RADIATED BAND EMISSION MEASUREMENT 24 3.3.1 TEST REQUIREMENT: 24 3.3.2 TEST PROCEDURE 24 3.3.3 DEVIATION FROM TEST STANDARD 24 3.3.4 TEST SETUP 25 3.3.5 EUT OPERATING CONDITIONS 25 4 . PEAK OUTPUT POWER 30 4.1 APPLIED PROCEDURES / LIMIT 30 4.1.1 TEST PROCEDURE 30 4.1.2 DEVIATION FROM STANDARD 30 4.1.3 TEST SETUP 30 4.1.4 EUT OPERATION CONDITIONS 30 Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260724006R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 3 of 35 Table of Contents Page 4.1.5 TEST RESULTS 30 5 . NUMBER OF HOPPING CHANNEL 31 5.1 APPLIED PROCEDURES / LIMIT 31 5.1.1 TEST PROCEDURE 31 5.1.2 DEVIATION FROM STANDARD 31 5.1.3 TEST SETUP 31 5.1.4 EUT OPERATION CONDITIONS 31 5.1.5 TEST RESULTS 31 6 . BANDWIDTH TEST 32 6.1 APPLIED PROCEDURES / LIMIT 32 6.1.1 TEST PROCEDURE 32 6.1.2 DEVIATION FROM STANDARD 32 6.1.3 TEST SETUP 32 6.1.4 EUT OPERATION CONDITIONS 32 6.1.5 TEST RESULTS 32 7 . HOPPING CHANNEL SEPARATION MEASUREMENT 33 7.1 APPLIED PROCEDURES / LIMIT 33 7.1.1 TEST PROCEDURE 33 7.1.2 DEVIATION FROM STANDARD 33 7.1.3 TEST SETUP 33 7.1.4 EUT OPERATION CONDITIONS 33 7.1.5 TEST RESULTS 33 8 . DWELL TIME OF OCCUPANCY 34 8.1 APPLIED PROCEDURES / LIMIT 34 8.1.1 TEST PROCEDURE 34 8.1.2 DEVIATION FROM STANDARD 34 8.1.3 TEST SETUP 34 8.1.4 EUT OPERATION CONDITIONS 34 8.1.5 TEST RESULTS 34 9 . ANTENNA REQUIREMENT 35 9.1 STANDARD REQUIREMENT 35 9.2 EUT ANTENNA 35 10 . TEST SETUP PHOTO 35 11 . EUT PHOTO 35 Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260724006R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 4 of 35 1. SUMMARY OF TEST RESULTS Test procedures according to the technical standards: FCC Part15 (15.247) , Subpart C Standard Section Test Item Judgment Remark 15.207 Conducted Emission PASS 15.247(c) Radiated Spurious Emission PASS 15.205 Band Edge Emission PASS 15.247(b)(1) Peak Output Power PASS 15.247(a)(iii) Number of Hopping Frequency PASS 15.247(a)(iii) Dwell Time PASS 15.247(a)(1) Bandwidth PASS 15.247(a)(1) Hopping Channel Separation PASS 15.203 Antenna Requirement PASS NOTE: (1)” N/A” denotes test is not applicable in this Test Report 1.1 MEASUREMENT UNCERTAINTY The reported uncertainty of measurement y ± U, where expended uncertainty U is based on a standard uncertainty multiplied by a coverage factor of k=2，providing a level of confidence of approximately 95 %。 No. Item Uncertainty 1 Conducted Emission Test ±2.56dB 2 RF power,conducted ±0.42dB 3 Spurious emissions,conducted ±2.76dB 4 All emissions,radiated(<1G) ±3.65dB 5 All emissions,radiated(>1G) ±4.89dB 6 Temperature ±0.5°C 7 Humidity ±2% 8 20dB Bandwidth ±0.2MHz Shenzhen DL Testing Technology Co., Ltd. Report No.: DLE-260724006R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 5 of 35 2. GENERAL INFORMATION 2.1 GENERAL DESCRIPTION OF EUT Product Name: wireless headphones Trade Mark: ROSESELSA Model Number: CERAMICS ULTRA, CERAMICS ULTRA 2 Model Difference All models are same as the samples except model name and color, they have the same structure and circuit. Operation Frequency: 2402~2480MHz Channel numbers: 79 Channels Channel separation: 1MHz Modulation technology: GFSK, π/4 DQPSK, 8DPSK Antenna Type: Internal Antenna Antenna gain: L: -3.12dBi R: -2.12dBi Power supply: DC 3.6V from battery DC 5V from charge Note: 1.…

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SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 1 Version：A0ATN-PAS-QD-0172 SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. SPECIFICATION FOR APPROVL CUSTOMER： Shenzhen Joining Free Technology Co.,Ltd. CUSTOMER PRJ RS18-8972 CUSTOMER P/N ： Antenna L:22160001 Antenna R:22160002 OUR MODEL NO： ATN56028 SPECIFICATIONS： 2.4～2.48GHz Q’TY ： 1 PCS DATE： 2025.7.15 AT NCUSTOMER makeexamine Approver Structure Electronics Approver Address: Address: 504-505,Summer Valley, MeishengChuanggu Science and Technology Innovation Park, Longchang Road, Xin'anStreet, Baoan District, Shenzhen. Tel：0755-29308863Fax：0755-29308861 SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 2 Version：A0ATN-PAS-QD-0172 contentPage Cover......1 Catalog......2 1、Test Equipment&Conditions ......3 2、Product Specification......4 3、Matching circuit......4 4、Test Data Report ......4 5、Assembly requirements......7 6、Product Drawing......8 7、Size test report ......9 8、Salt spray test report......10 9、Packaging Information......11 change record DateVersion VersionContent Notes 2025.7.15A0Initial release SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 3 Version：A0ATN-PAS-QD-0172 1、Test Equipment&Conditions 1.1Network Analyzers Agilent Technologies E5071B 1.2Communications Test Set CMW500 1.3 3D Chanber Test System SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 4 Version：A0ATN-PAS-QD-0172 2、Product Specification 2.1 、 Material&Mechanical Characteristics MaterialFPC Antenna typePIFA antenna 2.2、Storage conditions Storage Temperature 22°C±5°C relative humidity35-65% Storage life360 Day 3、Matching circuit Matching circuit-LMatching circuit-R 4、Test Data Report 4.1 S11 Parameter SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 5 Version：A0ATN-PAS-QD-0172 4.2 Gain & Efficiency 4.3 Radiation pattern L SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 6 Version：A0ATN-PAS-QD-0172 R 4 .4 OTATest Data Bluetooth BR (Free ) Bluetooth BR (head) SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 7 Version：A0ATN-PAS-QD-0172 4.5 Measured data 5、Assembly requirements SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 8 Version：A0ATN-PAS-QD-0172 6、Product Drawing Antenna Photo & Length (mm) SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 9 Version：A0ATN-PAS-QD-0172 7、Size test report project：RS18Product Name： AntennaL /AntennaR category：FPCQuantity：5 pcsDate：2025.7.15 Inspection basis and standard ■Engineering drawings □Standard template □Other Measurementequipment &accuracy Vernier caliper & 0.02mm Inspection items test value determine 12345 Dimensiona l inspection 1.L 2. 0.13±0.03 0.12 0.120.120.120.12ok 3. 13±0.1513.06 13.0213.0413.0613.08ok 4. 12.09±0.15 12.14 12.1212.1612.1412.14ok 5.R 6. 13±0.1513.06 13.0413.0613.0413.02ok 7. 12.09±0.15 12.08 12.1212.1212.1412.12ok 8. 0.13±0.03 0.12 0.120.120.120.12ok 9./ 10. 11. 12. SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 10 Version：A0ATN-PAS-QD-0172 8、Salt spray test report projectRS18Product Name： AntennaL /AntennaR Sample information quantity ： 5 PCS material quality ： Electrolytic copper Coating ： Gold plating Test conditions Salt solution ： 5% PH:7.0 Test temperature：35°Crelative humidity：5% Spray mode：■连续□间歇air pressure：1kg/cm² Salt spray settling rate：Mist collection：PH7.0nac Test cycle：__1__Spray time：24 h test result Appearance after test: the appearance is intact without obvious change Coating: no peeling and corrosion Surface spraying and silk screen printing: no falling off and bubble Test judgment OK Notes： 1、The operation standard of salt spray test shall be in accordance with the national standard of the people's Republic of China GB / t2423 17-2008 implementation. 2、The judgment standard of test piece results shall be in accordance with the national standard of the people's Republic of China GB / t6461-02. SHENZHEN ATN COMMUNICATION TECHNOLOGY CO.,LTD. Page 11 Version：A0ATN-PAS-QD-0172 9、Manner of packing SHENZHEN ATN COMMUNICATION EQUIPMENT CO.LTD Product packaging Version：：A0Page：1/1 1. Barrier paper protection products2. Put into PE sealed pocket 3.Put it in a cardboard box for packaging

Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 1 of 49 ANNEX TEST DATA EDR FCC ID: 2BUP4-CERAMICSULTRA Applicant: Chengdu ROSESELSA Technology Co., Ltd. Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Manufacturer: Chengdu ROSESELSA Technology Co., Ltd. Address: Room 302, 3rd Floor, Building 4, Yingcaijiayuan, No.569 East Jinfu Road, Zitong Community, Tianfu Block, Wenjiang District, Chengdu, Sichuan, China Product Name: wireless headphones Trade Mark: ROSESELSA Model Number: CERAMICS ULTRA, CERAMICS ULTRA 2 Date of Receipt: Jul. 24, 2026 Test Date: Jul. 24, 2026 – Aug. 04, 2026 Date of Report: Aug. 04, 2026 Prepared By: Shenzhen DL Testing Technology Co., Ltd. Address: 101-201, Comprehensive Building, Tongzhou Electronics Longgang Factory Area, No.1 Baolong Fifth Road, Baolong Community, Baolong Street, Longgang District, Shenzhen, China Applicable Standards: FCC PART 15 C 15.247 ANSI C63.10-2020 + Cor. 1-2023+C63.10a-2024 + Errata to C63.10a-2024 Test Result: Pass Report Number: DLE-260724006R Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 2 of 49 1. Bandwidth 1.1 Test Result 1.1.1 20dB BW Mode TX Type Frequency (MHz) Packet Type ANT 20dB Bandwidth (MHz) Verdict Result Limit GFSK SISO 2402 DH5 1 1.032 / Pass 2441 DH5 1 1.029 / Pass 2480 DH5 1 1.038 / Pass Pi/4DQPSK SISO 2402 2DH5 1 1.311 / Pass 2441 2DH5 1 1.317 / Pass 2480 2DH5 1 1.322 / Pass 8DPSK SISO 2402 3DH5 1 1.304 / Pass 2441 3DH5 1 1.306 / Pass 2480 3DH5 1 1.303 / Pass Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 3 of 49 1.2 Test Graph 1.2.1 20dB BW GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 4 of 49 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 5 of 49 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 6 of 49 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 7 of 49 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 8 of 49 2. Maximum Conducted Output Power 2.1 Test Result 2.1.1 Power Mode TX Type Frequency (MHz) Packet Type Maximum Peak Conducted Output Power (dBm) Verdict ANT1 Limit GFSK SISO 2402 DH5 1.58 <=20.97 Pass 2441 DH5 0.65 <=20.97 Pass 2480 DH5 -0.58 <=20.97 Pass Pi/4DQPSK SISO 2402 2DH5 2.45 <=20.97 Pass 2441 2DH5 1.54 <=20.97 Pass 2480 2DH5 0.29 <=20.97 Pass 8DPSK SISO 2402 3DH5 2.80 <=20.97 Pass 2441 3DH5 1.87 <=20.97 Pass 2480 3DH5 0.63 <=20.97 Pass Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 9 of 49 2.2 Test Graph 2.2.1 Power GFSK_DH5_LCH_2402MHz_Ant1_NTNV GFSK_DH5_MCH_2441MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 10 of 49 GFSK_DH5_HCH_2480MHz_Ant1_NTNV Pi/4DQPSK_2DH5_LCH_2402MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 11 of 49 Pi/4DQPSK_2DH5_MCH_2441MHz_Ant1_NTNV Pi/4DQPSK_2DH5_HCH_2480MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 12 of 49 8DPSK_3DH5_LCH_2402MHz_Ant1_NTNV 8DPSK_3DH5_MCH_2441MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 13 of 49 8DPSK_3DH5_HCH_2480MHz_Ant1_NTNV Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: [email protected] Page 14 of 49 3. Carrier Frequency Separation 3.1 Test Result 3.1.1 Ant1 Ant1 Mode TX Type Frequency (MHz) Packet Type Channel Separation (MHz) 20dB Bandwidth (MHz) Limit (MHz) Verdict GFSK SISO HOPP DH5 1.000 1.038 >=0.692 Pass Pi/4DQPSK SISO HOPP 2DH5 0.958 1.322 >=0.881 Pass 8DPSK SISO HOPP 3DH5 0.991 1.306 >=0.871 Pass Test Report Tel: 400-688-3552 Web:www.dl-cert.com Email: service@dl-cert…

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