2BKBS-STR-SMALL-BTTWS Speaker

- Lenfo rd Far Ea st Limite d - Federa l Communications Commission Authori zation and Evaluation Division Equipment Authori zation Bra nch 7435 Oakland Mills Road Columbia, MD 21046 8/15/24 U.S. Agent Designation Lenford Far East Limited acknowledges their consent for the following contact located in the United States to act as their agent for serv ice of pro cess for the equipment for which authori zation is sought (F CC ID: 2BKBS-S TR- SMALL-B T): Name and company of U.S. agent:Linkwld LLC Physical U.S. addre ss of agent:1942 Bro adway St. STE 314C, Boulder, CO, 80302, US FRN of U.S. agent:0033625682 Email addre ss of U.S. agent:Timothy.linkwld@pro ton.me Linkwld LLC acknowledges t heir obligation to accept serv ice of pro cess on behalf of Lenford Far East Limited. Lenford Far East Limited with the FRN 0035818475 accepts its obligation to maintain an agent for serv ice of pro cess in the United States for no less than one year after either the gra ntee has perm anently term inated all mark eting and import ation of the applicable equipment within the U.S., or the conclusion of any Commission- re lated administra tive or judicial pro ceeding involving the equ ipment, whichever is later. By signing this form , we confirm the above and that we are aware of the application re quire ments listed under § 2.911(d )(7 ). The inform ation pro vided in this letter is based on the re fere nced ru le part s of Title 47 of the CFR as well as KDB 986446 D01. An expira tion date for this letter does not exist. In case the U.S. agent changes, the gra ntee is obligated to notify the FCC within 30 days via the gra nting TCB. Sincerely, Signature [Name]Mina Hu [Title]Sales [Company]Lenford Far East Limited Signature [Name of U.S. agent]Timothy Zhu [Title of U.S. agent]Manager [Company of U.S. agent]Linkwld LLC 48_[model] US_Agent_2.911(d)(7)-U, V05

C5266091_X24_Ed.2 1/1 Lenford Far East Limited “Attestation Statements” 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: Lenford Far East Limited FRN: 0035818475 Grantee code: 2BKBS FCC ID: 2BKBS-STR-SMALL-BT Contact Name: Mina Hu Address: Unit 1606, 16F., Comweb Plaza 12 Cheung Yue Street, Lai Chi Kok Kowloon, Hong Kong, China Telephone No: (852) 27436766 Fax No: / Email: [email protected] i. [Lenford Far East Limited] (“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. [Lenford Far East Limited] (“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. [Lenford Far East Limited] (“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: 2024/08/20 Applicant’s Name: Mina Hu Title: Sales 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

LenfordFarEastLimited DeclarationonModelDifferences We, LenfordFarEastLimited Unit1606,16F.,ComwebPlaza12CheungYueStreet,LaiChiKokKowloon,Hong Kong,China Declarethatthefollowingproduct(s): FCCID:2BKBS-STR-SMALL-BT ProductName:TWSSpeaker ModelNo.:TWIN-2,MT13,MT13B,MT38,MT17,Twin,Twin-3,Twin-4,Twin-5,Twin-6, Mega-Twin,Master-Twin,Burst,Burst-2,Burst-3,Spark,Spark-2,Spark-3,Zing!,Zing!-2, Zing!-3,Buzz,Roar,Zenith,Flux,Zenith,Thrive,Remix,Flash,Pop,Flick,Snap,Zapp,Rave, Jive,Whiz,Blip Utilizetheidenticalcircuitdesign,PCBlayout,shieldingandinterfacewith(TWIN-2),only modelnameandappearancecolordifferent.Thereforethisapplicationcanberegardedas identicalinperformancetothesubmittedtestsample. Themanufacturerwouldtakealltheresponsibilitiesfortheaboveproduct(s). Forandonbehalfof Sincerely, Signature MinaHu Sales LenfordFarEastLimited *IherebydeclarethatIamentitledtosignonbehalfoftheapplicantandthattheinformationsuppliediscorrectandcomplete.

C5266091_X8_Ed.1 1/1 Letter of Authorization Lenford Far East Limited Company: Lenford Far East Limited Address: Unit 1606, 16F., Comweb Plaza 12 Cheung Yue Street, Lai Chi Kok Kowloon, Hong Kong, China Product Name: TWS Speaker Model Number: TWIN-2, MT13, MT13B, MT38, MT17, Twin, Twin-3, Twin-4, Twin-5, Twin-6, Mega-Twin, Master-Twin, Burst, Burst-2, Burst-3, Spark, Spark-2, Spark-3, Zing!, Zing!-2, Zing!-3, Buzz, Roar, Zenith, Flux, Zenith, Thrive, Remix, Flash, Pop, Flick, Snap, Zapp, Rave, Jive, Whiz, Blip FCC Identifier: 2BKBS-STR-SMALL-BT 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: Mina Hu Date: 2024.08.20 Title: Manager Signature of applicant:

C5266091_X10_Ed.2 1/1 LenfordFarEastLimited OfficeofEngineeringTechnology FederalCommunicationsCommission 7435OaklandMillsRoad Columbia,MD21046 Date:2024-08-20 Subject:RequestforConfidentiality FCCID:2BKBS-STR-SMALL-BT ToWhomItMayConcern, PursuanttotheprovisionsofSections0.457and0.459ofCommission'srules (47CFR0.457,0.459),wearerequestingtheCommissiontowithholdthefollowing attachment(s)asconfidentialdocumentfrompublicdisclosure. ExhibitsLong-Term Confidentiality Short-TermConfidentiality 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 abovearewithheldfrompublicviewforaperiodof__180__daysfromthedateofthe GrantofEquipmentAuthorizationandpriortomarketing. Itisourunderstandingthatallmeasurementtestreports,FCCIDlabelformatand correspondentduringcertificationreviewprocesscannotbegrantedasconfidential documentsandthoseinformationwillbeavailableforpublicreviewoncethegrantof equipmentauthorizationisissued. C5266091_X10_Ed.2 1/1 Sincerely, Signature: Name:MinaHu Title:Sales 2024.08.20

LabelLocationOnEUT Label ProductName:TWSSpeaker ModelNo.:TWIN-2 FCCID:2BKBS-STR-SMALL-BT

RFEXPOSUREEVALUATION FCCID:2BKBS-STR-SMALL-BT AccordingtoKDB447498D01MobileandPortableDevicesRFExposure ProceduresandEquipmentAuthorizationPoliciesv06. AccordingtoFCC1.1310:Thecriterialistedinthefollowingtableshallbeusedto evaluatetheenvironmentimpactofhumanexposuretoradiofrequency(RF)Radiationas specifiedin§1.1307(b): RoutineSARevaluationreferstothatspecificallyrequiredby§2.1093,using measurementsorcomputersimulation.WhenroutineSARevaluationisnotrequired, portabletransmitterswithoutputpowergreaterthantheapplicablelowthresholdrequire SARevaluationtoqualifyforTCBapproval. Channel (MHz) Maximum output power (dBm) Tuneup tolerance (dBm) MaxTuneUp Power(dBm) Distance (mm) Calculation results Limit Operating Mode 2402-0.43-0.43±10.57050.3533 GFSK2441-1.33-1.33 ± 1-0.33050.2903 2480-2.19-2.19±1-1.19050.2393 24021.381.38±12.38050.5363 π/4-DQPSK24410.580.58 ± 11.58050.4503 2480-0.65-0.65±10.35050.3413 24021.491.49±12.49050.5503 8DPSK24410.600.60 ± 11.60050.4523 24800.010.01±11.01050.3973 Result:NoStandaloneSARtestisrequired.

PCB Antenna Summary ITEM ANT SPEC Model Name 2.4G ANT Horizontal Vertical 2400MHz 2450MHz2500MHz2400MHz2450MHz 2500MHz Center Frequency dBi -1.26 -0.76 -0.58 -5.25 -2.46 -1.86 MAX. Gain -0.58dBi Polarization Horizontal and Vertical Azimuth Beam Pattern Omni-directional Impedance 50 Ohm Antenna Length 38.20mm Manufacture ZHUHAI JIELI TECHNOLOGY CO.,LTD Antenna Photo & Length (mm) Horizontal: 2400 MHz 2450 MHz 2500 MHz Max: 0 Min: -40 Scale: 5/div Gain(dBi) 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 Max: 0 Min: -30 Scale: 5/div Gain(dBi) 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

ReportNo.:1812C40001012501Page1of39 FCCID:2BKBS-STR-SMALL-BT FCCTestReport Applicant:LenfordFarEastLimited Address: Unit1606,16F.,ComwebPlaza12CheungYue Street,LaiChiKokKowloon,HongKong,China ProductName:TWSSpeaker ReportDate:Aug.20,2024 ShenzhenAnbotekComplianceLaboratoryLimited ReportNo.:1812C40001012501Page2of39 FCCID:2BKBS-STR-SMALL-BT Contents 1.GeneralInformation.................................................................................................................................6 1.1.ClientInformation...........................................................................................................................6 1.2.DescriptionofDevice(EUT)..........................................................................................................6 1.3.AuxiliaryEquipmentUsedDuringTest..........................................................................................7 1.4.Operationchannellist....................................................................................................................7 1.5.DescriptionofTestModes.............................................................................................................8 1.6.MeasurementUncertainty.............................................................................................................8 1.7.TestSummary................................................................................................................................9 1.8.DescriptionofTestFacility...........................................................................................................10 1.9.Disclaimer....................................................................................................................................10 1.10.TestEquipmentList....................................................................................................................11 2.Antennarequirement..............................................................................................................................13 2.1.Conclusion...................................................................................................................................13 3.ConductedEmissionatACpowerline..................................................................................................14 3.1.EUTOperation.............................................................................................................................14 3.2.TestSetup....................................................................................................................................14 3.3.TestData......................................................................................................................................15 4.OccupiedBandwidth..............................................................................................................................17 4.1.EUTOperation.............................................................................................................................17 4.2.TestSetup....................................................................................................................................18 4.3.TestData......................................................................................................................................18 5.MaximumConductedOutputPower......................................................................................................19 5.1.EUTOperation.............................................................................................................................19 5.2.TestSetup....................................................................................................................................20 5.3.TestData......................................................................................................................................20 6.ChannelSeparation...............................................................................................................................21 6.1.EUTOperation.............................................................................................................................21 6.2.TestSetup....................................................................................................................................21 6.3.TestData......................................................................................................................................21 7.NumberofHoppingFrequencies...........................................................................................................22 7.1.EUTOperation.............................................................................................................................22 7.2.TestSetup....................................................................................................................................22 7.3.TestData......................................................................................................................................22 8.DwellTime..............................................................................................................................................23 8.1.EUTOperation.............................................................................................................................24 8.2.TestSetup....................................................................................................................................24 8.3.TestData......................................................................................................................................24 9.Emissionsinnon-restrictedfrequencybands.......................................................................................25 9.1.EUTOperation.............................................................................................................................26 9.2.TestSetup.........…

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Page 1 of 53 AppendixTestData ReportNo:1812C40001012501TestSampleNO:1-2-2 StartTestDate：2024.8.5FinishTestDate:2024.8.6 TestEngineer:Auditor: Temperature:22.6 °C RelativeHumidity:55% Pressure:101kPa AppendixA:20dBEmissionBandwidth TestResult TestModeAntennaFrequency[MHz] 20db EBW[MHz] FL[MHz]FH[MHz]Limit[MHz]Verdict DH5Ant124020.942401.572402.51------ DH5Ant124410.942440.572441.51------ DH5Ant124800.952479.572480.52------ 2DH5Ant124021.342401.362402.70------ 2DH5Ant124411.342440.362441.70------ 2DH5Ant124801.312479.392480.70------ 3DH5Ant124021.322401.372402.69------ 3DH5Ant124411.302440.392441.69------ 3DH5Ant124801.332479.372480.70------ Page 2 of 53 TestGraphs DH5-Ant1-2402 DH5-Ant1-2441 Page 3 of 53 DH5-Ant1-2480 2DH5-Ant1-2402 Page 4 of 53 2DH5-Ant1-2441 2DH5-Ant1-2480 Page 5 of 53 3DH5-Ant1-2402 3DH5-Ant1-2441 Page 6 of 53 3DH5-Ant1-2480 Page 7 of 53 AppendixB:OccupiedChannelBandwidth TestResult TestModeAntennaFrequency[MHz] OCB[MHz] FL[MHz]FH[MHz]Limit[MHz]Verdict DH5Ant124020.8422401.61042402.4525------ DH5Ant124410.8572440.60442441.4615------ DH5Ant124800.8572479.60442480.4615------ 2DH5Ant124021.1842401.44562402.6294------ 2DH5Ant124411.1992440.43662441.6354------ 2DH5Ant124801.1842479.43962480.6234------ 3DH5Ant124021.1842401.44862402.6324------ 3DH5Ant124411.1932440.43962441.6324------ 3DH5Ant124801.1992479.43662480.6354------ Page 8 of 53 TestGraphs DH5-Ant1-2402 DH5-Ant1-2441 Page 9 of 53 DH5-Ant1-2480 2DH5-Ant1-2402 Page 10 of 53 2DH5-Ant1-2441 2DH5-Ant1-2480 Page 11 of 53 3DH5-Ant1-2402 3DH5-Ant1-2441 Page 12 of 53 3DH5-Ant1-2480 Page 13 of 53 AppendixC:Maximumconductedoutputpower TestResultPeak Test Mode AntennaFrequency[MHz] ConductedPeak Power[dBm] Conducted Limit[dBm] Verdict DH5Ant12402-0.43≤20.97PASS DH5Ant12441-1.33≤20.97PASS DH5Ant12480-2.19≤20.97PASS 2DH5Ant124021.38≤20.97PASS 2DH5Ant124410.58≤20.97PASS 2DH5Ant12480-0.65≤20.97PASS 3DH5Ant124021.49≤20.97PASS 3DH5Ant124410.60≤20.97PASS 3DH5Ant124800.01≤20.97PASS TestGraphs DH5-Ant1-2402-PASS Page 14 of 53 DH5-Ant1-2441-PASS DH5-Ant1-2480-PASS Page 15 of 53 2DH5-Ant1-2402-PASS 2DH5-Ant1-2441-PASS Page 16 of 53 2DH5-Ant1-2480-PASS 3DH5-Ant1-2402-PASS Page 17 of 53 3DH5-Ant1-2441-PASS 3DH5-Ant1-2480-PASS Page 18 of 53 AppendixD:Carrierfrequencyseparation TestResult TestModeAntennaFrequency[MHz]Result[MHz]Limit[MHz]Verdict DH5Ant1Hop0.997≥0.633PASS 2DH5Ant1Hop1.287≥0.893PASS 3DH5Ant1Hop0.971≥0.887PASS TestGraphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Page 19 of 53 3DH5-Ant1-Hop-PASS Page 20 of 53 AppendixE:Timeofoccupancy TestResult TestModeAntennaFrequency[MHz] BurstWidth [ms] TotalHops [Num] Result[s]Limit[s]Verdict DH1Ant1Hop0.3953160.125≤0.4PASS DH3Ant1Hop1.6511610.266≤0.4PASS DH5Ant1Hop2.8991050.304≤0.4PASS 2DH1Ant1Hop0.4053180.129≤0.4PASS 2DH3Ant1Hop1.6561670.277≤0.4PASS 2DH5Ant1Hop2.9041030.299≤0.4PASS 3DH1Ant1Hop0.4063150.128≤0.4PASS 3DH3Ant1Hop1.6561530.253≤0.4PASS 3DH5Ant1Hop2.9081110.323≤0.4PASS Page 21 of 53 TestGraphs DH1-Ant1-Hop-PASS Page 22 of 53 DH3-Ant1-Hop-PASS Page 23 of 53 DH5-Ant1-Hop-PASS Page 24 of 53 2DH1-Ant1-Hop-PASS Page 25 of 53 2DH3-Ant1-Hop-PASS Page 26 of 53 2DH5-Ant1-Hop-PASS Page 27 of 53 3DH1-Ant1-Hop-PASS Page 28 of 53 3DH3-Ant1-Hop-PASS Page 29 of 53 3DH5-Ant1-Hop-PASS Page 30 of 53 AppendixF:Numberofhoppingchannels TestResult TestModeAntennaFrequency[MHz]Result[Num]Limit[Num]Verdict DH5Ant1Hop79≥15PASS 2DH5Ant1Hop79≥15PASS 3DH5Ant1Hop79≥15PASS TestGraphs DH5-Ant1-Hop-PASS 2DH5-Ant1-Hop-PASS Page 31 of 53 3DH5-Ant1-Hop-PASS Page 32 of 53 AppendixG:Bandedgemeasurements TestResult TestModeAntennaChNameFrequency[MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5Ant1Low2402-0.87-46.99≤-20.87PASS DH5Ant1High2480-2.64-46.84≤-22.64PASS DH5Ant1LowHop_2402-1.56-46.83≤-21.56PASS DH5Ant1HighHop_2480-3.27-46.65≤-23.27PASS 2DH5Ant1Low2402-1.39-46.68≤-21.39PASS 2DH5Ant1High2480-2.65-46.56≤-22.65PASS 2DH5Ant1LowHop_2402-1.26-47.25≤-21.26PASS 2DH5Ant1HighHop_2480-3.98-46.49≤-23.98PASS 3DH5Ant1Low2402-0.65-48.13≤-20.65PASS 3DH5Ant1High2480-2.77-46.53≤-22.77PASS 3DH5Ant1LowHop_2402-1.89-48.1≤-21.89PASS 3DH5Ant1HighHop_2480-3.16-45.97≤-23.16PASS Page 33 of 53 TestGraphs DH5-Ant1-2402-PASS DH5-Ant1-2480-PASS Page 34 of 53 DH5-Ant1-Hop_2402-PASS DH5-Ant1-Hop_2480-PASS Page 35 of 53 2DH5-Ant1-2402-PASS 2DH5-Ant1-2480-PASS Page 36 of 53 2DH5-Ant1-Hop_2402-PASS 2DH5-Ant1-Hop_2480-PASS Page 37 of 53 3DH5-Ant1-2402-PASS 3DH5-Ant1-2480-PASS Page 38 of 53 3DH5-Ant1-Hop_2402-PASS 3DH5-Ant1-Hop_2480-PASS Page 39 of 53 AppendixH:ConductedSpuriousEmission TestResult TestModeAntennaFrequency[MHz] FreqRange [MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5Ant124020~Reference-2.47-2.47---PASS DH5Ant1240230~1000-2.47-54.3≤-22.47PASS DH5Ant124021000~26500-2.47-55.15≤-22.47PASS DH5Ant124410~Reference-2.75-2.75---PASS DH5Ant1244130~1000-2.75-54.91≤-22.75PASS DH5Ant124411000~26500-2.75-54.56≤-22.75PASS DH5Ant124800~Reference-3.38-3.38---PASS DH5Ant1248030~1000-3.38-52.23≤-23.38PASS DH5Ant124801000~26500-3.38-55.33≤-23.38PASS 2DH5Ant124020~Reference-2.19-2.19---PASS 2DH5Ant1240230~1000-2.19-52.22≤-22.19PASS 2DH5Ant124021000~26500-2.19-55.14≤-22.19PASS 2DH5Ant124410~Reference-5.81-5.81---PASS 2DH5Ant1244130~1000-5.81-53.98≤-25.81PASS 2DH5Ant124411000~26500-5.81-54.37≤-25.81PASS 2DH5Ant124800~Reference-3.48-3.48---PASS 2DH5Ant1248030~1000-3.48-55.24≤-23.48PASS 2DH5Ant124801000~26500-3.48-54.61≤-23.48PASS 3DH5Ant124020~Reference-4.57-4.57---PASS 3DH5Ant1240230~1000-4.57-55.05≤-24.57PASS 3DH5Ant124021000~26500-4.57-55.09≤-24.57PASS 3DH5Ant124410~Reference-4.33-4.33---PASS 3DH5Ant1244130~1000-4.33-54.08≤-24.33PASS 3DH5Ant124411000~26500-4.33-54.17≤-24.33PASS 3DH5Ant124800~Reference-4.51-4.51---PASS 3DH5Ant1248030~1000-4.51-54.6≤-24.51PASS 3DH5Ant124801000~26500-4.51-55.1≤-24.51PASS Page 40 of 53 TestGraphs DH5-Ant1-2402-0~Reference-PASS DH5-Ant1-2402-30~1000-PASS Page 41 of 53 DH5-Ant1-2402-1000~26500-PASS DH5-Ant1-2441-0~Reference-PASS Page 42 of 53 DH5-Ant1-2441-30~1000-PASS DH5-Ant1-2441-1000~26500-PASS Page 43 o…

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