2BTR9-XTEINKX4XTEINK X4

Shenzhen Xiaohu Xingtong Technology Co., Ltd. Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 [December 22, 2025] U.S. Agent Designation [Shenzhen Xiaohu Xingtong Technology Co., Ltd.] acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought FCC ID: 2BTR9-XTEINKX4 Name and company of U.S. agent: [GLOCERTS TECHNOLOGY INC] Physical U.S. address of agent: [19784 SUNKISSED RIDGE DR, RIVERSIDE, CA 92507] FRN of U.S. agent: [0036339737] Email address of U.S. agent: [[email protected]] Telephone of U.S.agent: (626) 588-8039 [GLOCERTS TECHNOLOGY INC] acknowledges their obligation to accept service of process on behalf of [Shenzhen Xiaohu Xingtong Technology Co., Ltd.]. [Shenzhen Xiaohu Xingtong Technology Co., Ltd.] with the FRN [0037772233] accepts its obligation to maintain an agent for service of process in the United States for no less than 1 year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). 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. Sincerely, Signature Signature [Chen Chu] [Huiying Fan] [Manager] [Director] [Shenzhen Xiaohu Xingtong Technology Co., Ltd.] [GLOCERTS TECHNOLOGY INC]

Shenzhen Xiaohu Xingtong Technology Co., Ltd. (December 22, 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: 2BTR9-XTEINKX4 [Shenzhen Xiaohu Xingtong 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. 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) Chen Chu Shenzhen Xiaohu Xingtong Technology Co., Ltd. (December 22, 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: 2BTR9-XTEINKX4 [Shenzhen Xiaohu Xingtong 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. Sincerely, (Applicant signature) (Applicant printed name) Chen Chu

Shenzhen Xiaohu Xingtong Technology Co., Ltd. (December 22, 2025) Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (XTEINK X4 / XTEINK X4 / FCC ID: 2BTR9-XTEINKX4 ) 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: Chen Chu Title: Manager

Shenzhen Xiaohu Xingtong Technology Co., Ltd. (December 22, 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: Chen Chu Title: Manager

Shenzhen CTB Testing Technology Co., Ltd. Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 3 Model: XTEINK X4 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

FCC ID LABEL: Label Location: FCC ID: 2BTR9-XTEINKX4 Model No.: XTEINK X4

Shenzhen CTB Testing Co., Ltd. FCC ID: 2BTR9-XTEINKX4 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. BLE:1M 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 -0.543 0.88 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.44 -0.166 0.96 0±1 1.00 1.26 <5 0.39330 3.00 YES 2.480 0.545 1.13 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK BLE:2M 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 -0.939 0.81 0±1 1.00 1.26 <5 0.39023 3.00 YES 2.44 -0.454 0.90 0±1 1.00 1.26 <5 0.39330 3.00 YES 2.480 0.213 1.05 0±1 1.00 1.26 <5 0.39651 3.00 YES GFSK 2.4GWIFI: 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 2.412 7.993 6.307±18.006.31<51.959833.00YES 2.437 6.341 4.316±17.005.01<51.564803.00YES 2.462 7.044 5.067±18.006.31<51.980043.00YES 2.412 7.435 5.547±18.006.31<51.959833.00YES 2.437 7.605 5.767±18.006.31<51.969963.00YES 2.462 7.635 5.807±18.006.31<51.980043.00YES 2.412 6.661 4.646±17.005.01<51.556753.00YES 2.437 6.792 4.786±17.005.01<51.564803.00YES 2.462 7.36 5.457±18.006.31<51.980043.00YES 2.422 7.1 5.137±18.006.31<51.963893.00YES 2.437 7.136 5.177±18.006.31<51.969963.00YES 2.452 7.323 5.407±18.006.31<51.976013.00YES 802.11b 802.11g 802.11n( HT20) 802.11n( HT40) Conclusion: For the max result : 1.98004≤ FCC Limit 3.0 for 1g SAR.

ReportNo.:RFI-LAB-RF-202512-LL06-1 QP030-E41 Page1of10 TestingReport CustomerName:ShenzhenXiaohuXingtongTechnologyCo.,Ltd. ProductName:XTEINKX4 SampleModel:XTEINKX4 ReferenceStandard:GB/T9410-2008;ANSI/IEEEStd149-1979 IssueDate:2025.12.25 Engineer:Date:2025.12.25 Auditor:Date:2025.12.25 Approver:Date:2025.12.25 ReportNo.:RFI-LAB-RF-202512-LL06-1 QP030-E41 Page2of10 Version VersionNo.DateDescriptionFormulateApproval A02025.12.25Forthefirsttime,formulateZkrisEason Contents 1.GeneralInformation.........................................................................................................................3 1.1Generalinformationoftestinginstitutions...........................................................................3 1.2Testingprinciple...................................................................................................................3 1.3Testequipment......................................................................................................................4 1.4Testenvironment...................................................................................................................4 1.5Statement..............................................................................................................................4 2.SampleInformation.........................................................................................................................5 2.1Clientinformation.................................................................................................................5 2.2DescriptionofEUT(S)..........................................................................................................5 2.3EUTappearance....................................................................................................................6 2.4EUTsetupphotooffreespaceOTAtesting.........................................................................6 3.TestResults......................................................................................................................................7 3.1Teststandard.........................................................................................................................7 3.2Testuncertainty.....................................................................................................................7 3.3Testdata................................................................................................................................8 3.3.1S11parameters...........................................................................................................8 3.3.2S11data......................................................................................................................8 3.3.3Typicalfreespaceefficiencyandgain......................................................................8 3.3.4Typicalfreespaceradiationpattern...........................................................................9 （Thefollowingisblank）..............................................................................................................10 ReportNo.:RFI-LAB-RF-202512-LL06-1 QP030-E41 Page3of10 1.GeneralInformation 1.1Generalinformationoftestinginstitutions Name ShenzhenRFI-LABCommunicationTechnologyCo.,Ltd. Address 103Building1TingweilndustrialPark,No.6,LiufangRoad,Zone 67Xingdong,Xin'anSubdistrict,Bao'anDistrict,Shenzhen,Guangdong,China Tel 13682621346 E-mail [email protected] Equipment Alltheequipmentusedinthereportisfixedin103Building1Tingweilndustrial Park,No.6,LiufangRoad,Zone67Xingdong,Xin'anSubdistrict,Bao'anDistrict, Shenzhen,Guangdong,China 1.2Testingprinciple ReportNo.:RFI-LAB-RF-202512-LL06-1 QP030-E41 Page4of10 1.3Testequipment EquipmentModelNo.SerialNo.Manufacturer Calibration date Next calibration date OTATest System RayZone-5000 RFI-LAB-RF -D00 GTS2023.3.142026.3.13 Network Analyzer E5071C RFI-LAB-RF -D01 KEYSIGHT2025.5.262026.5.25 Network Analyzer E5071C RFI-LAB-RF -C02 KEYSIGHT2025.5.262026.5.25 1.4Testenvironment Temperature 23.7°C Humidity 58%RH Pressure 100.13kPa 1.5Statement (1)Thetestresultsinthereportareonlyapplicabletothetestedsamplesandthetestedsamples workundertheenvironmentdescribedinthereport. (2)OnlyShenzhenRFI-LABCommunicationTechnologyCo.,Ltd.havetherighttomodifythe report,andthemodificationinformationshallbeannotatedintherevisionform. (3)Anyobjectiontothisreportshallberaisedwithin30daysafterformalconfirmationofthe report. (4)Thisreportisinvalidifthereisanyevidencethatthesampleinformationprovidedisfalsified. (5)Thereportisinvalidwithoutthesignatureoftheauditorandapprover. ReportNo.:RFI-LAB-RF-202512-LL06-1 QP030-E41 Page5of10 2.SampleInformation 2.1Clientinformation Name ShenzhenXiaohuXingtongTechnologyCo.,Ltd. Address Room1209,YichuangInternationalCenter,Building2B,No.8,Golf Avenue,GuangpeiCommunity,GuanlanStreet,LonghuaDistrict, Shenzhen,China Contacts RitaXiao Tel 13538218145 E-mail [email protected] Manufacturer ShenzhenXiaohuXingtongTechnologyCo.,Ltd. Address Room1209,YichuangInternationalCenter,Building2B,No.8,Golf Avenue,GuangpeiCommunity,GuanlanStreet,LonghuaDistrict, Shenzhen,China 2.2DescriptionofEUT(S) ProductName XTEINKX4 SampleModel XTEINKX4 SerialNo. / AntennaType PCBAntenna TestItem VSWR;Antennagain;Efficiency;Radiationpattern FrequencyRange 2400~2500MHz ReceivedDate 2025.12.25 TestDate 2025.12.25 Remark / ReportNo.:RFI-LAB-RF-202512-LL06-1 QP030-E41 Page6of10 2.3 EUTappearance 2.4EUTsetupphotooffreespaceOTAtesting Planform Frontview ReportNo.:RFI-LAB-RF-202512-LL06-1 QP030-E41 Page7of10 3.TestResults 3.1Teststandard NameParameterMethodStandardno. Mobile communication antenna Antennagain Genericspecification forantennasusedinthe mobilecommunications GB/T 9410-2008 Radiationpattern VSWR Antenna Radiationefficiency IEEEStandardTest ProceduresforAntennas ANSI/IEEEStd 149-1979 Gainanddirectivity 3.2Testuncertainty TheuncertaintywascalculatedonthebasisoftheGUMpublishedbyISO,usingthe inclusionfactorofK=2andthe95%con…

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Report Tel: 4008-707-283Web: http://www.ctb-lab.net Page 1 of 40 TEST REPORT Compiled by: Reviewed by: Approved by: Kai Chen Martin Feng 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. Test item description: XTEINK X4 FCC ID: 2BTR9-XTEINKX4 Trademark(s): N/A Model/Type reference: XTEINK X4 Applicant’s name: Shenzhen Xiaohu Xingtong Technology Co., Ltd. Address: Room 1209, Yichuang International Center, Building 2B, No. 8, Golf Avenue, Guangpei Community, Guanlan Street, Longhua District, Shenzhen, China Manufacturer: Shenzhen Xiaohu Xingtong Technology Co., Ltd. Address: Room 1209, Yichuang International Center, Building 2B, No. 8, Golf Avenue, Guangpei Community, Guanlan Street, Longhua 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, S henzhen, Guangdong, China Sample Received Date: Nov. 29, 2025 Sample tested Date: Nov. 29, 2025 to Dec. 02, 2025 Issue Date: Dec. 02, 2025 Report No.: CTB25112901002RF01 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.: CTB25112901002RF01 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 40 TABLE OF CONTENT Test Report Declaration Page 1. VERSION ........................................................................................................................................ 3 2. TEST SUMMARY ........................................................................................................................... 4 3. MEASUREMENT UNCERTAINTY ................................................................................................. 5 4. PRODUCT INFORMATION AND TEST SETUP ............................................................................ 6 4.1 Product Information .......................................................................................................................... 6 4.2 Test Setup Configuration .................................................................................................................. 6 4.3 Support Equipment........................................................................................................................... 6 4.4 Channel List ..................................................................................................................................... 7 4.5 Test Mode ........................................................................................................................................ 7 4.6 Test Environment ............................................................................................................................. 7 5. TEST FACILITY AND TEST INSTRUMENT USED ....................................................................... 8 5.1 Test Facility ...................................................................................................................................... 8 5.2 Test Instrument Used ....................................................................................................................... 8 6. AC POWER LINE CONDUCTED EMISSION ................................................................................ 10 6.1 Block Diagram Of Test Setup ......................................................................................................... 10 6.2 Limit ................................................................................................................................................ 10 6.3 Test procedure ............................................................................................................................... 10 6.4 Test Result ..................................................................................................................................... 12 7. RADIATED SPURIOUS EMISSION ............................................................................................. 14 7.1 Block Diagram Of Test Setup ......................................................................................................... 14 7.2 Limit ................................................................................................................................................ 14 7.3 Test procedure ............................................................................................................................... 15 7.4 Test Result ..................................................................................................................................... 16 8. BAND EDGE AND RF COUNDUCTED SPURIOUS EMISSIONS ............................................... 23 8.1 Block Diagram Of Test Setup ......................................................................................................... 23 8.2 Limit ................................................................................................................................................ 23 8.3 Test procedure ............................................................................................................................... 23 8.4 T est Result ..................................................................................................................................... 24 9. COU…

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Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 1 of 63 TEST REPORT Compiled by: Reviewed by: Approved by: Kai Chen Martin Feng 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. Test item description: XTEINK X4 FCC ID: 2BTR9-XTEINKX4 Trademark(s): N/A Model/Type reference: XTEINK X4 Applicant’s name: Shenzhen Xiaohu Xingtong Technology Co., Ltd. Address: Room 1209, Yichuang International Center, Building 2B, No. 8, Golf Avenue, Guangpei Community, Guanlan Street, Longhua District, Shenzhen, China Manufacturer: Shenzhen Xiaohu Xingtong Technology Co., Ltd. Address: Room 1209, Yichuang International Center, Building 2B, No. 8, Golf Avenue, Guangpei Community, Guanlan Street, Longhua 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: Nov. 29, 2025 Sample tested Date: Nov. 29, 2025 to Dec. 02, 2025 Issue Date: Dec. 02, 2025 Report No.: CTB25112901002RF02 Test Standards FCC CFR Title 47 Part 15 Subpart C Section 15.247 ANSI C63.10:2020 Test Results PASS Remark: This is WIFI-2.4GHz band radio test report. Shenzhen CTB Testing Technology Co., Ltd. Report No.: CTB25112901002RF02 Report Tel: 4008-707-283 Web: http://www.ctb-lab.net Page 2 of 63 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..................................................... 39 8.1 Block Diagram Of Test Setup ............................................…

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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: XTEINK X4 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