2BGQJ-YZ75Keyboard

Attestation Statements (May 31, 2024) 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 for (FCC ID: 2BGQJ-YZ75 ) (Hunan Yunxi Electronic Commerce Co., Ltd.), the undersigned, hereby authorize (NEWENERGYER LIMITED) to act as our designated U.S. agent for service of process, (Hunan Yunxi Electronic Commerce 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. (NEWENERGYER LIMITED) 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: Hunan Yunxi Electronic Commerce Co., Ltd. Contact Name: Yilong Wang Address: Room 99, 3rd Floor, A2 Building, Chuanggu Industrial Park, No.568 Queyuan Road, Tianxin District, Changsha City, Hunan Province, China 410114 Telephone No: 13538214502 Email: [email protected] FRN: 0035493568 Signature [Yilong Wang] U.S. Agent Information: Company Name: NEWENERGYER LIMITED Address: 1818 S Patton Ct, Denver, CO, 80219 Contact Name: CHUN LIU Telephone No: 213 289 5042 Email: [email protected] FRN: 0034665885 Signature [CHUN LIU]

(Hunan Yunxi Electronic Commerce Co., Ltd.) (May 31, 2024) 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: 2BGQJ-YZ75) [Hunan Yunxi Electronic Commerce 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) Yilong Wang (Hunan Yunxi Electronic Commerce Co., Ltd.) (May 31, 2024) 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: 2BGQJ-YZ75) [Hunan Yunxi Electronic Commerce 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) Yilong Wang

Shenzhen LESHI Video Technology Co.,Ltd Model Difference Data：May 31, 2024 Product description: Keyboard Model name: YZ75, C68, AL66, AL71, AL75, YZ87, YZ98, B75, B98, L75, YZ19, RT68, RT75, AL87, B68, AL80, AL68, D98, X71, X75 Trade Name: YUNZII FCC ID: 2BGQJ-YZ75 All the model are the same circuit and RF module, except model names . Regards Sincerely Client’s signature : Client’s name / title : Yilong Wang（Manager） Contact information / address：Room 99, 3rd Floor, A2 Building, Chuanggu Industrial Park, No.568 Queyuan Road, Tianxin District, Changsha City, Hunan Province, China 410114

Hunan Yunxi Electronic Commerce Co., Ltd. (May 31, 2024) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (Keyboard / YZ75, C68, AL66, AL71, AL75, YZ87, YZ98, B75, B98, L75, YZ19, RT68, RT75, AL87, B68, AL80, AL68, D98, X71, X75 / FCC ID: 2BGQJ-YZ75) 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: Yilong Wang Title: Manager

Hunan Yunxi Electronic Commerce Co., Ltd. (May 31, 2024) 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: Yilong Wang Title: Manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 4 Model: YZ75 External Photos Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 3 of 4 Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 4 of 4

FCC ID LABEL: Label Location: FCC ID: 2BGQJ-YZ75 Model No.: YZ75

Shenzhen CTB Testing Co., Ltd. FCC ID: 2BGQJ-YZ75 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 1.964 1.57 1±1 2.00 1.58 <5 0.49127 3.00 YES 2.441 2.757 1.89 2±1 3.00 2.00 <5 0.62347 3.00 YES 2.480 1.547 1.43 1±1 2.00 1.58 <5 0.49918 3.00 YES 2.402 2.165 1.65 2±1 3.00 2.00 <5 0.61847 3.00 YES 2.441 2.948 1.97 2±1 3.00 2.00 <5 0.62347 3.00 YES 2.480 1.733 1.49 1±1 2.00 1.58 <5 0.49918 3.00 YES 2.402 2.156 1.64 2±1 3.00 2.00 <5 0.61847 3.00 YES 2.441 2.981 1.99 2±1 3.00 2.00 <5 0.62347 3.00 YES 2.480 1.788 1.51 1±1 2.00 1.58 <5 0.49918 3.00 YES GFSK π /4DQPSK 8DQPSK BLE: 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 2.883 1.94 2±1 3.00 2.00 <5 0.61847 3.00 YES 2.44 3.634 2.31 3±1 4.00 2.51 <5 0.78474 3.00 YES 2.480 2.477 1.77 2±1 3.00 2.00 <5 0.62843 3.00 YES GFSK Conclusion: For the max result : 0.78474≤ FCC Limit 3.0 for 1g SAR.

Inverted F Antenna Specification Summary ITEMANT SPEC Model Name 2.4G ANT HorizontalVertical 2400MHz 2400MHz2500MHz2400MHz2400MHz 2500MHz Center Frequency -1.26-0.76-0.58-5.25-2.46-1.86 MAX. Gain -0.58dB PolarizationHorizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance50 Ohm Antenna Length 38.20mm Manufacture ZHUHAI JIELI TECHNOLOGY CO.,LTD Antenna Photo & Length (mm) Horizontal: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -40 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -1.26174 -30.0801 -7.18716 2450 -0.765802 -36.5604 -7.48023 2500 -0.585582 -22.0315 -6.59127 Vertical: 2400 MHz 2450 MHz 2500 MHz Power (dBm) Max: 0 Min: -30 Scale: 5/div Gain(dB) Frequency (MHz) Max Min Avg 2400 -5.2537 -22.1424 -12.4294 2450 -2.4652 -24.5837 -10.4702 2500 -1.86120 -29.5214 -9.20432 ANT Test Labs：Attestation of Global Compliance Co., Ltd.

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: Keyboard FCC ID: 2BGQJ-YZ75 Trademark: YUNZII Model Number: YZ75, C68, AL66, AL71, AL75, YZ87, YZ98, B75, B98, L75, YZ19, RT68, RT75, AL87, B68, AL80, AL68, D98, X71, X75 Prepared For: Hunan Yunxi Electronic Commerce Co., Ltd. Address: Room 99, 3rd Floor, A2 Building, Chuanggu Industrial Park, No.568 Queyuan Road, Tianxin District, Changsha City, Hunan Province, China 410114 Manufacturer: Hunan Yunxi Electronic Commerce Co., Ltd. Address: Room 99, 3rd Floor, A2 Building, Chuanggu Industrial Park, No.568 Queyuan Road, Tianxin District, Changsha City, Hunan Province, China 410114 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: May. 15, 2024 Sample tested Date: May. 15, 2024 to May. 20, 2024 Issue Date: May. 20, 2024 Report No.: CTB240520064RFX Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2013 Test Results PASS Remark: This is Bluetooth radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.:CTB240520064RFX Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 55 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 .................................................................................. 11 6.1 Block Diagram Of Test Setup ........................................................................................................... 11 6.2 Limit .................................................................................................................................................. 11 6.3 Test procedure ................................................................................................................................. 11 6.4 Test Result ....................................................................................................................................... 13 7. RADIATED SPURIOUS EMISSION ............................................................................................... 15 7.1 Block Diagram Of Test Setup ........................................................................................................... 15 7.2 Limit .................................................................................................................................................. 15 7.3 Test procedure ................................................................................................................................. 16 7.4 Test Result ....................................................................................................................................... 17 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS ................................................ 26 8.1 Block Diagram Of Test Setup ........................................................................................................... 26 8.2 Limit .................................................................................................................................................. 26 8.3 Test procedure ................................................................................................................................. 26 8.4 Test Result ...........................................................................................................…

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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: YZ75 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