2A83K-XT88True wireless bluetooth headset

Page1of1 Declarationonmodeldifference We,Shenzhenxiaomasupplychaintechnologyco.,ltd,theundersigned herebyconfirmthatthesemodelsareidentical,andallmodelshavethesame RFmoduleandAntenna,onlytheappearancecolorisdifferent. ProductnameTruewirelessbluetoothheadset ModelNo. XT88,XT86,XT85II,XT82,XT81,XT80,XT95pro,XT97,XT98, XT99,XT83II,XT95II TradenameLenovo FCCID2A83K-XT88 Confirmedby: Client’ssignature: Client’sname/title:Maowenzhe/Supplychaindirector Date:2022-11-14

C5266091_X8_Ed.1 1/1 LetterofAuthorization Shenzhenxiaomasupplychaintechnologyco.,ltd Company:Shenzhenxiaomasupplychaintechnologyco.,ltd Address:Room501,AudioFactory,No.13HuanchengSouthRoad,Ma 'antangCommunity,BantianStreet,LonggangDistrict,Shenzhen ProductName:Truewirelessbluetoothheadset ModelNumber:XT88,XT86,XT85 II ,XT82,XT81,XT80,XT95pro, XT97,XT98,XT99,XT83II,XT95II FCCIdentifier:2A83K-XT88 WeauthorizeLGAITechnologicalCenterS.A.,RondadelaFontdelCarme,s/n, 08193Bellaterra,Spain,toactonourbehalfonallmattersconcerningthe abovenamedequipment. AnyindividualwithinLGAITechnologicalCenterS.A.isauthorizedtoactonour behalfandtakeactionontheapplication. WedeclarethatauthorizeLGAITechnologicalCenterS.A.,RondadelaFontdel Carme,s/n,08193Bellaterra,Spain,isallowedtoforwardallinformation relatedtotheapprovalprojecttotheFederalCommunicationCommissionand todiscussanyissuesconcerningtheapprovalapplication.Anyandallacts carriedoutbyLGAITechnologicalCenterS.A.onourbehalfshallhavethe sameeffectasactsofourown. Name:MaowenzheDate:2022-11-14 Title:Supplychaindirector Signatureofapplicant:

C5266091_X10_Ed.2 1/1 Shenzhenxiaomasupplychaintechnologyco.,ltd OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 Date:2022-11-14 Subject:RequestforConfidentiality FCCID:2A83K-XT88 ToWhomItMayConcern, PursuanttotheprovisionsofSections0.457and0.459ofCommission'srules (47CFR0.457,0.459),wearerequestingtheCommissiontowithholdthefollowing attachment(s)asconfidentialdocumentfrompublicdisclosure. ExhibitsLong-Term Confidentiality Short-Term Confidentiality NOTE2 IDLabel/LocationNoNo AttestationStatementNoNo ExternalPhotosNo ☐ BlockDiagram ☒☐ Schematics ☒☐ TestReportNoNo TestSetupPhotosNo ☐ User’sManual ☐ NOTE 1 ☐ InternalPhotos ☐ NOTE 1 ☐ PartsList/TuneUp ☐☐ RFExposureInfoNoNo OperationalDescription ☒☐ CoverLetter(s)NoNo SDRSoftware/SecurityInfo ☐ No NOTE1:Long-TermConfidentialitymaybepermittedunderspecialconditions(SeeII.LONG-TERMCONFIDENTIALITY,Section3of KDB726920,uselastinforce) NOTE2:Short-TermConfidentialitycanberequestedforamaximumof180daysfromthedateofthegrant. Abovementioneddocumentcontainsdetailedsystemandequipmentdescriptionare consideredasproprietaryinformationinoperationoftheequipment.Thepublic disclosureofabovedocumentsmightbeharmfultoourcompanyandwouldgive competitoranunfairadvantageinthemarket. Incaseofshort-termConfidentiality,theapplicantrequeststheexhibitsselected abovearewithheldfrompublicviewforaperiodofdaysfromthedateofthe GrantofEquipmentAuthorizationandpriortomarketing. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondentduringcertificationreviewprocesscannotbegrantedasconfidential documentsandthoseinformationwillbeavailableforpublicreviewoncethegrantof equipmentauthorizationisissued. Sincerely, C5266091_X10_Ed.2 1/1 Signature: Name:Maowenzhe Title:Supplychaindirector

Leftearphone Rightearphone

FCCID:2A83K-XT88

Right: ANT Left:

Page 1 of 2 RF EXPOSURE EVALUATION Model difference: XT88, XT86, XT85II, XT82, XT81, XT80, XT95pro, XT97, XT98, XT99, XT83II, XT95IIonly the appearance color is different. The test model is XT88. Product Name : True wireless bluetooth headset Model Name : XT88, XT86, XT85II, XT82, XT81, XT80, XT95pro, XT97, XT98, XT99, XT83II, XT95II Bluetooth Version : BT5.3 BDR and BLE Operating frequency : 2402-2480MHz Numbers of Channel : 40 channels For DTS 79 channels for DSS Antenna Type : Chip Antenna Antenna Gain : 1.15 dBi Type of Modulation : GFSK for DTS GFSK, Π/4-DQPSK For DSS Power supply : Li-ion Battery : 401012 Rated Voltage: 3.7V Capacity: 35mAh Hardware Version : Y668-V02-0504 Software Version : V230-DNS Page 2 of 2 Standard Requirement According to § 15.247(i) and § 1.1307b(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 levels in excess of the Commission’s guidelines. See KDB 447498 D01 General RF Exposure Guidance v06, section 4. 3. 1. The 1-g and 10-g SAR test exclusion thresholds for 100MHz to 6GHz at test separation distances ≤ 50mm 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 SAR 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. The test exclusions are applicable only when the minimum test separation distance is ≤ 50mm and for transmission frequencies between 100MHz and 6GHz. When the minimum test separation distance is <5mm, a distance of 5mm is applied to determine SAR test exclusion. Routine SAR evaluation refers to that specifically required by § 2.1093, using measurements or computer simulation. When routine SAR evaluation is not required, portable transmitters with output power greater than the applicable low threshold require SAR evaluation to quality for TCB approval. Channel (MHz) Maximum output power (dBm) Tune up tolerance (dBm) Max Tune Up Power (mW) Distance (mm) Calculation results Limit Operating Mode 2441 5.71 5.71 ± 1 4.688134 5 1.464920 3 BDR 2440 5.30 5.30 ± 1 4.265795 5 1.332677 3 BLE According to KDB 447498, no stand-alone required for BT antenna, and no simultaneous SAR measurement is required. Signature Ronnie Liu EMC Manager Date: 2022-11-14

Report No.: PTC22101308902E-FC01 Page 1 of 73 FCC TEST REPORT FCC ID: 2A83K-XT88 Product : True wireless bluetooth headset Model Name : XT88, XT86, XT85II, XT82, XT81, XT80, XT95pro, XT97, XT98, XT99, XT83II, XT95II Brand : Lenovo Report No. : PTC22101308902E-FC01 Prepared for Shenzhen xiaoma supply chain technology co., ltd Room 501, Audio Factory, No.13 Huancheng South Road, Ma 'antang Community, Bantian Street, Longgang District, Shenzhen Prepared by Precise Testing & Certification Co., Ltd. Building 1, No. 6, Tongxin Road, Dongcheng Street, Dongguan, Guangdong, China Report No.: PTC22101308902E-FC01 Page 2 of 73 1 TEST RESULT CERTIFICATION Applicant’s name : Shenzhen xiaoma supply chain technology co., ltd Address : Room 501, Audio Factory, No.13 Huancheng South Road, Ma 'antang Community, Bantian Street, Longgang District, Shenzhen Manufacture's name : Lenovo (Beijing) Co., Ltd Address : 201-h2-6, floor 2, building 2, No. 6, Shangdi West Road, Haidian District, Beijing Product name : True wireless bluetooth headset Model name : XT88, XT86, XT85II, XT82, XT81, XT80, XT95pro, XT97, XT98, XT99, XT83II, XT95II Standards : FCC CFR47 Part 15 Section 15.247 Test procedure : ANSI C63.10:2013 Test Date : Oct. 20, 2022 to Oct. 28, 2022 Date of Issue : Nov. 14, 2022 Test Result : Pass This device described above has been tested by PTC, and the test results show that the equipment under test (EUT) is in compliance with the FCC requirements. And it is applicable only to the tested sample identified in the report. This report shall not be reproduced except in full, without the written approval of PTC, this document may be altered or revised by PTC, personal only, and shall be noted in the revision of the document. Test Engineer: Simon Pu / Engineer Technical Manager: Ronnie Liu / Manager Report No.: PTC22101308902E-FC01 Page 3 of 73 Contents Page 1 TEST RESULT CERTIFICATION .............................................................................................................................. 2 2 TEST SUMMARY ......................................................................................................................................................... 5 3 TEST FACILITY ............................................................................................................................................................ 5 4 GENERAL INFORMATION ........................................................................................................................................ 6 4.1 GENERAL DESCRIPTION OF E.U.T. .................................................................................................................... 6 4.2 TEST MODE ........................................................................................................................................................ 7 5 EQUIPMENT DURING TEST ..................................................................................................................................... 9 5.1 EQUIPMENTS LIST............................................................................................................................................... 9 5.2 MEASUREMENT UNCERTAINTY ......................................................................................................................... 11 5.3 DESCRIPTION OF SUPPORT UNITS ................................................................................................................... 12 6 CONDUCTED EMISSION ......................................................................................................................................... 13 6.1 E.U.T. OPERATION ........................................................................................................................................... 13 6.2 EUT SETUP ...................................................................................................................................................... 13 6.3 TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) .................................................................................. 14 6.4 MEASUREMENT PROCEDURE: .......................................................................................................................... 14 6.5 CONDUCTED EMISSION LIMIT ........................................................................................................................... 14 6.6 MEASUREMENT DESCRIPTION .......................................................................................................................... 14 6.7 CONDUCTED EMISSION TEST RESULT ............................................................................................................. 14 7 RADIATED SPURIOUS EMISSIONS ..................................................................................................................... 17 7.1 EUT OPERATION .............................................................................................................................................. 17 7.2 TEST SETUP ..................................................................................................................................................... 18 7.3 SPECTRUM ANALYZER SETUP .......................................................................................................................... 19 7.4 TEST PROCEDURE ............................................................................................................................................ 20 7.5 SUMMARY OF TEST RESULTS .......................................................................................................................... 21 8 MAXIMUM PEAK OUTPUT POWER TEST .......................................................................................................... 28 8.1 TEST STANDARD AND LIMIT .............................................................................................................................. 28 8.2 TEST SETUP ....…

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2.4GHz3216ChipAntenna:RANT3216F245C02 _ Application: WLAN,802.11b/g,Bluetooth,WLAN,etc... Features SMD,highreliability,ultraImpact,Omni-directional... PartnumberInformation RANT3216F245C02 (A)(B)(C)(D)(E)(F) ElectricalSpecification ThespecificationisdefinedonEVB. DimensionandTerminalConfiguration No.TerminalName 1Feeding/GNG 2GND/Feeding (A)ProductTypeChipAntenna (B)SizeCode 3.2x1.6mm( ± 0.2mm) (C)MaterialHighKmaterial (D)Frequency2.4~2.5GHz (E)FeedingmodePIFA&SingleFeeding (F)AntennatypeType=02 WorkingFrequencyRange2400~2500MHz Bandwidth120MHz(Min.) PeakGain1.15dBi(Typ.) Impedance50Ohm Returnloss10dB(Min) PolarizationLinear AzimuthBeamwidthOmni-directional OperationTemperature( °C )-40~85 °C ResistancetoSolderingHeats 10sec.(@280 °C ) TerminationNi/Au(Leadless) Dimension(mm) L 3.20 ± 0.20 W 1.60±0.20 T 0.45±0.20 咏成國際科技有限公司電話 :13530576606 RAINInternationalTechnologyCo.,Ltd. TEL:13530576606 2.4GHz3216ChipAntenna:RANT3216F245C02 _ 1 EvaluationBoardReference PCBDimensionAntennaLayoutReference Unit:mm ElectricalCharacteristics ReturnLoss&Radiation ReturnLoss Frequency(MHz) S11(dB) 2400-10.50 2450-30.62 2500-11.47 Radiation 2400MHz2450MHz2500MHz Efficiency82.52%85.26%83.01% PeakGain 1.11dBi 1.15dBi 0.56dBi X Y Z 2400MHz 2450MHz 2500MHz 3 3 3 0 0 0 2.4GHz3216ChipAntenna:RANT3216F245C02 _ TapingSpecifications ReelandTapingSpecification ReelSpecification TYPESIZEABCD 32167”5K/Reel 9.0±0.5 60±213.5±0.5178±2 TappingSpecification PackagingTypeABWEFGHTψDP PaperType3216 1.90±0.203.50±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.10 1.50±0.10 4.0±0.1 2.4GHz3216ChipAntenna:RANT3216F245C02 _ ReliabilityTable TestItemProcedure Requirements CeramicType Remark (Reference) Electrical Characterization Fulfilltheelectrical specification UserSpec. Thermal Shock 1.Preconditioning: 50±10°C/1hr,thenkeepfor24±1hrsatroomtemp. 2.Initialmeasure:Spec:referInitialspec. 3.Rapidchangeoftemperaturetest: -30°Cto+85°C;100cycles; 15minutesatLowercategorytemperature; 15minutesatUppercategorytemperature. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 107 Temperature Cycling 1.Initialmeasure:Spec:referInitialspec. 2.100Cycles(-30°Cto+85°C),SoakMode=1(2Cycle/hours). 3.Measurementat24±2Hoursaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. JESD22 JA104 HighTemperature Exposure 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered;500hours@T=+85°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 LowTemperature Storage 1.Initialmeasure:Spec:referInitialspec. 2.Unpowered:500hours@T=-30°C. 3.Measurementat24±2hoursaftertest. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 108 Solderability (SMDBottomSide) Dippingmethod: a.Temperature:235±5°C b.Dippingtime:3±0.5s Thesoldershouldcover over95%ofthecritical areaofbottomside. IEC60384-21/22 4.10 SolderingHeat Resistance (RSH) Preheatingtemperature:150±10°C. Preheatingtime:1~2min. Soldertemperature:260±5°C. Dippingtime:5±0.5s NoVisibleDamage.IEC60384-21/22 4.10 Vibration5g'sfor20min.,12cycleseachof3orientations Note:Use8"X5"PCB.031"thick7securepointson,onelong sideand2securepointsatcornersofoppositesides.Parts mountedwithin2"fromanysecurepoint.Testfrom10-2000 Hz. NoVisibleDamage.MIL-STD-202 Method204 Mechanical Shock Threeshocksineachdirectionshallbeappliedalongthethree mutuallyperpendicularaxesofthetestspecimen(18shocks) Peakvalue:1,500g’s Duration:0.5ms Velocitychange:15.4ft/s Waveform:Half-sine NoVisibleDamage.MIL-STD-202 Method213 Humidity Bias 1.Humidity:85%R.H.,Temperature:85±2°C. 2.Time:500±24hours. 3.Measurementat24±2hrsaftertestcondition. NoVisibleDamage. Fulfilltheelectrical specification. MIL-STD-202 Method106 2.4GHz3216ChipAntenna:RANT3216F245C02 _ Board Flex (SMD) 1.Mountingmethod: IR-Reflow.PCBSize(L:100×W:40×T:1.6mm) 2.Applytheloadindirectionofthearrowuntilbendingreaches 2mm. NoVisibleDamage.AEC-Q200 005 AdhesionForceof1.8Kgfor60seconds.NoVisibleDamage Magnificationof20Xor greatermaybeemployed forinspectionofthe mechanicalintegrityofthe devicebodyterminalsand body/terminaljunction. AEC-Q200 006 Physical Dimension Anyapplicablemethodusingx10magnification,micrometers, calipers,gauges,contourprojectors,orothermeasuring equipment,capableofdeterminingtheactualspecimen dimensions. Inaccordancewith specification. JESD22 JB100 RevisionHistory RevisionDateContent 12019/10/01NewDatasheet

ConductedEmissions RadiatedEmissions From30MHz-1000MHz TestfrequencyfromAbove1GHz