2BB27-K3C0003TWS Headset

Powerontun a- FCC StatementThis device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1)This device may not cause harmful interference.(2)This device must accept any interference received, including interference that maycause undesired operation.2. Changes or modifications not expressly approved by the party responsible forcompliance could void the user s authority to operate the equipment. Note:This equipment has been tested and found to comply with the limits for a class B digital device,pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.This equipment generates uses and can radiate radio frequence energy and,if not installed and used in accordance with the instructions,may cause harmful interference to radio communications.However,there is no guarantee that interference will not occur in a particular installation.if this equipmemt does cause harmful interference to radio or television reception,which can be determined by t urning the equipment off and on,the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an autlet on a circui t different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV te chnician for help. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condi tion without restriction.

Foshan Heizuan Trading Co., Ltd 2024-01-10 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: 2BB27-K3C0003) [Foshan Heizuan Trading 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, suihao pang Manager Foshan Heizuan Trading Co., Ltd One of the first floors of Building A, No. 8, Fengxiugang Industrial Zone, Bichong, Huangqi, Nanhai District, Foshan City Foshan Heizuan Trading Co., Ltd 2024-01-10 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: 2BB27-K3C0003) [Foshan Heizuan Trading 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, suihao pang Manager Foshan Heizuan Trading Co., Ltd One of the first floors of Building A, No. 8, Fengxiugang Industrial Zone, Bichong, Huangqi, Nanhai District, Foshan City

AttestationStatements (2023-7-13) 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 (GC:2BB27) ( Foshan Heizuan Trading Co., Ltd ), the undersigned, hereby authorize (VISHTEC LLC) to act as our designated U.S. agent for service of process,( Foshan Heizuan TradingCo., 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. (VISHTEC LLC) accepts the responsibility to act as designated U.S. agent for service of process. Applicant Information： Company name:Foshan Heizuan Trading Co., Ltd Contact Name: suihao pang Address:One of the first floors of Building A, No. 8, Fengxiugang Industrial Zone, Bichong, Huangqi, Nanhai District, Foshan City FRN:0033999012 Telephone No: 18520203949 Email: [email protected] Signature [suihao pang] U.S. AgentInformation: CompanyName: VISHTECLLC Address: 9888 W BelleviewAve Ste 2142 DenverCO 80123 FRN: 0033407131 ContactName: Alan Graham TelephoneNo:（571）4007350 Email: [email protected] Signature [Alan Graham]

Foshan Heizuan Trading Co., Ltd 2024-01-10 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 Guangdong Global 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, suihao pang Manager Foshan Heizuan Trading Co., Ltd One of the first floors of Building A, No. 8, Fengxiugang Industrial Zone, Bichong, Huangqi, Nanhai District, Foshan City

Foshan Heizuan Trading Co., Ltd 2024-01-10 Eurofins Electrical and Electronic Testing NA, Inc. 914 West Patapsco Avenue Baltimore, MD 21230 RE: CONFIDENTIALITY REQUEST FOR (EUT Name: TWS Headset /Model: k3c0003/FCC ID: 2BB27-K3C0003) 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 (Block Diagram ,Operational Description,Schematics) required to be submitted with this application be permanently withheld from public review. The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. Please contact me if there is any information you may need. Sincerely, suihao pang Manager Foshan Heizuan Trading Co., Ltd One of the first floors of Building A, No. 8, Fengxiugang Industrial Zone, Bichong, Huangqi, Nanhai District, Foshan City

External

Internal 2.4GHz Antenna BT

RF EXPOSURE EVALUATION EUT Specification EUT TWS Headset Model Number k3c0001 Series Model N/A FCC ID 2BB27-K3C0003 Antenna gain (Max) 1.95 dBi Operation Frequency 2402-2480MHz Rating DC 5V Classification Per Stipulated Test Standard §15.247(i), §2.1093 Modulation GFSK, π/4-DQPSK, 8DPSK Max. output power BR+EDR: -2.18 dBm(0.605mW) Test Requirement: According to ß15.247(i) and ß1.1307(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. Routine SAR evaluation refers to that specifically required by ß2.1093, 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. One antenna is available for the EUT. The minimum separation distance is 5mm. BR+EDR: According to KDB 447498, no stand-alone required for BT antenna, and no simultaneous SAR measurement is required. Signature: Shawn Wen Date: 2024-01-04 Transmit Frequency (MHz) Mode Measure d Power (dBm) Tune up Power (dBm) Max tune up power(dBm) Calculation Result 1-g SAR 2402 BR+EDR (3DH5) -2.18 -2±1 -1 0.2462 3

2.4GHz2012 Chip Antenna:RANT2012F245X5 Dimension(mm) L2.05+-0.15 W1.20+-0.15 T0. 85+-0.10 No.TerminalName 1Feeding/GNG 2GND Application: WLAN,802.11b/g,Bluetooth,WLAN,etc ... Features SMD,high reliability,ultra Impact,Omni-directional... Part numberInformation RANT2012F245X5 (A)(B)(C)(D)(E)(F) (A)ProductTypeChip Antenna (B) Size Code2.0x1.2mm(+-0.2mm) (C) MaterialHigh K material (D) Frequency2.4 ~ 2.5GHz (E) FeedingmodePIFA& SingleFeeding (F) AntennatypeType=5 ElectricalSpecification WorkingFrequencyRange2400~2484MHz Bandwidth84 (Min.) PeakGain1.95 dBi (Typ.) Impedance50 Ohm Returnloss10 dB ( Min) PolarizationLinear AzimuthBeamwidthOmni-directional OperationTemperature( °C )-40 ~85 °C Resistanceto SolderingHeats 10sec.( @ 280°C) TerminationNi / Au (Leadless) The specificationis definedon EVB. Dimensionand TerminalConfiguration RAINInternationalTechnologyCo., Ltd.TEL:13530576606 EvaluationBoardReference PCBDimensionAntennaLayoutReference Unit:mm ElectricalCharacteristics ReturnLoss ReturnLoss&Radiation 1 Frequency(MHz) S11(dB) 2400-10.77 2450-24.81 2484-10.243 Radiation Z Y X 2400MHz2450MHz2500MHz Efficiency70.56%75.25%71.01% 1.69dB1.95dB1.72dBPeakGainiii 2.11 dBi 2.69 dBi2.26 dBi Directivity 2.4GHz2012ChipAntenna:RANT2012F245X5 TapingSpecifications ReelandTapingSpecification ReelSpecification TYPESIZEABCD 20127”5K/Reel 9.0±0.5 60±213.5±0.5178±2 TappingSpecification PackagingTypeABWEFGHTDP PaperType2012 1.50±0.202.30±0.208.0±0.201.75±0.103.5±0.054.0±0.102.0±0.050.75±0.101.57±0.104.0±0.1 2.4GHz2012ChipAntenna:RANT2012F245X5 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 2.4GHz2012ChipAntenna:RANT2012F245X5 2.4GHz2012ChipAntenna:RANT2012F245X5 _ 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 12020/10/15NewDatasheet

TRF No.: 04-E001-0B TRF Originator: GTG TRF Date: 2023-12-13 Web: www.gtggroup.com E-mail: [email protected] Tel.: 86-400 755 8988 CFR 47 FCC PART 15 SUBPART C(DSS) TEST REPORT For TWS Headset MODEL NUMBER: k3c0003 REPORT NUMBER: E04A23120758F00101 ISSUE DATE: Jan. 4, 2024 FCC ID: 2BB27-K3C0003 Prepared for Foshan Heizuan Trading Co., Ltd One of the first floors of Building A, No. 8, Fengxiugang Industrial Zone, Bichong, Huangqi, Nanhai District, Foshan City Prepared by Guangdong Global Testing Technology Co., Ltd. Room 101-105, 203-210, Building 1, No.2, Keji 8 Road, Songshan Lake Park, Dongguan city, Guangdong, People’s Republic of China, 523808 This report is based on a single evaluation of the submitted sample(s) of the above mentioned Product, it does not imply an assessment of the production of the products. This report shall not be reproduced, except in full, without the written approval of Guangdong Global Testing Technology Co., Ltd. REPORT NO.: E04A23120758F00101 Page 2 of 131 TRF No.: 04-E001-0B Global Testing , Great Quality. Revision History Rev. Issue Date Revisions Revised By V0 Jan. 4, 2024 Initial Issue REPORT NO.: E04A23120758F00101 Page 3 of 131 TRF No.: 04-E001-0B Global Testing , Great Quality. Summary of Test Results Test Item Clause Limit/Requirement Result Antenna Requirement N/A FCC Part 15.203/15.247 (c) Complianc e AC Power Line Conducted Emission ANSI C63.10-2013 Clause 6.2 FCC Part 15.207 Pass Conducted Output Power ANSI C63.10-2013 Clause 7.8.5 FCC Part 15.247 (b)(1) Pass 20 dB Bandwidth ANSI C63.10-2013 Clause 6.9.2 FCC Part 15.247 (a)(1) Pass Carrier Hopping Channel Separation ANSI C63.10-2013 Clause 7.8.2 FCC Part 15.247 (a)(1) Pass Number of Hopping Frequency ANSI C63.10-2013 Clause 7.8.3 FCC Part 15.247 (b)(1) Pass Time of Occupancy (Dwell Time) ANSI C63.10-2013 Clause 7.8.4 FCC Part 15.247 (a)(1) Pass Conducted Bandedge and Spurious Emission ANSI C63.10-2013 Clause 6.10.4 & Clause 7.8.8 FCC Part 15.247(d) Pass Radiated Band edge and Spurious Emission ANSI C63.10-2013 Clause 6.3 & 6.5 & 6.6 FCC Part 15.205/15.209 Pass Duty Cycle ANSI C63.10-2013, Clause 11.6 None; for reporting purposes only. Pass *This test report is only published to and used by the applicant, and it is not for evidence purpose in China. *The measurement result for the sample received is <Pass> according to <CFR 47 FCC PART 15 SUBPART C(DSS)> when <Accuracy Method> decision rule is applied. REPORT NO.: E04A23120758F00101 Page 4 of 131 TRF No.: 04-E001-0B Global Testing , Great Quality. CONTENTS 1. ATTESTATION OF TEST RESULTS ..................................................................................... 5 2. TEST METHODOLOGY ......................................................................................................... 6 3. FACILITIES AND ACCREDITATION ..................................................................................... 6 4. CALIBRATION AND UNCERTAINTY ................................................................................... 7 4.1. MEASURING INSTRUMENT CALIBRATION ........................................................... 7 4.2. MEASUREMENT UNCERTAINTY ............................................................................ 7 5. EQUIPMENT UNDER TEST .................................................................................................. 8 5.1. DESCRIPTION OF EUT ........................................................................................... 8 5.2. CHANNEL LIST ........................................................................................................ 8 5.3. MAXIMUM AVERAGE EIRP ..................................................................................... 9 5.4. TEST CHANNEL CONFIGURATION ........................................................................ 9 5.5. THE WORSE CASE POWER SETTING PARAMETER ............................................ 9 5.6. DESCRIPTION OF AVAILABLE ANTENNAS ......................................................... 10 5.7. SUPPORT UNITS FOR SYSTEM TEST ................................................................. 10 5.8. SETUP DIAGRAM .................................................................................................. 11 6. MEASURING EQUIPMENT AND SOFTWARE USED......................................................... 12 7. ANTENNA PORT TEST RESULTS ..................................................................................... 13 7.1. Conducted Output Power ........................................................................................ 13 7.2. 20 dB Bandwidth ..................................................................................................... 15 7.3. Carrier Hopping Channel Separation ...................................................................... 16 7.4. Number of Hopping Frequency ............................................................................... 18 7.5. Time of Occupancy (Dwell Time) ............................................................................ 20 7.6. Conducted Bandedge and Spurious Emission ........................................................ 22 7.7. Duty Cycle .............................................................................................................. 24 8. RADIATED TEST RESULTS ............................................................................................... 25 8.1. Radiated Band edge and Spurious Emission .......................................................... 31 9. ANTENNA REQUIREMENT ................................................................................................ 43 10. AC POWER LINE CONDUCTED EMISSION ......................................................... 44 11. TEST DATA - Appendix A ..................................................................................... 47 APPENDIX: PHOTOGRAPHS OF TEST CONFIGURATION ................................................... 108 APPENDIX: PHOTOGRAPHS OF THE EUT ...........…

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AC Power Line Conducted Emission Radiated Band edge and Spurious Emission