2A7DX-AIRBUDS4Wireless Earphone

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, and (2) this device must accept any interference received, including interference that may cause undesired operation.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 frequency 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 equipment does cause harmful interference to radio or television reception, which can be determined by turning 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 outlet on a circuit different from that to which the receiver is connected.· Consult the dealer or an experienced radio/TV technician for help. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

DOKE COMMUNI CATION (HK) LIMITED The inform ation provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. F ederal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 5/5/2023 U.S. Agent Desig nation DO KE COMMUNICATION (HK) LIMITED 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: 2A7DX-AIRBUDS4): Name and company of U.S. agent: Tim Payne, FCC US Agent, LLC Physical U.S. address of agent: 3722 Illinois Avenue, Saint Charles, IL, 60174, USA FRN of U.S. agent: 0033402884 Email address of U.S. agent: [email protected] FCC US Agent, LLC acknowledges their obligation to accept service of process on behalf of DOKE COMMUNICATION (HK) LIMITED. DOKE COMMUNICATION (HK) LIMITED with the FRN 0032533945 accepts its obligation to maintain an agent for service of process in the United States for no less than one 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). Sincerely, Sign ature Lynne Chen Manager DOKE COMMUNICATION (HK) LIMITED Sign ature Tim Payne Mana ger FCC US Agent, LLC 48_[ model] US_Agent_2.911(d)(7)-U, V04

Page 1 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. External Photos Photo 1 Photo 2 Page 2 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 3 Photo 4 Page 3 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 5 Photo 6 Page 4 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 7 Photo 8 Page 5 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 9 Photo 10 Page 6 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 11 Photo 12 Page 7 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 13 Photo 14 Page 8 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 15 Photo 16 Page 9 of 9 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 17 ------End------

Label FCC ID: 2A7DX-AIRBUDS4

Page 1 of 6 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Internal Photos Photo 1 Photo 2 Page 2 of 6 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 3 Photo 4 Page 3 of 6 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 5 Photo 6 Page 4 of 6 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 7 Photo 8 Page 5 of 6 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 9 Photo 10 Antenna Antenna Page 6 of 6 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Photo 11 ------End------

Page 1 of 2 Report No.: AIT23033110FH1 RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description Wireless Earphone Model Name AirBuds 4 FCC ID 2A7DX-AIRBUDS4 2. Applicable Standard According to §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 §1.1310 and §2.1093 RF exposure requirement KDB447498 v06: Mobile and Portable Devices RF Exposure Procedures and Equipment Authorization Policies 3. Requirement According to KDB447498 D01 General RF Exposure Guidance v06 Section 4.3.1 Standalone SAR test exclusion considerations: “Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition, listed below, is satisfied. These test exclusion conditions are based on source-based time-averaged maximum conducted output power of the RF channel requiring evaluation, adjusted for tune-up tolerance, and the minimum test separation distance required for the exposure conditions.22 The minimum test separation distance is determined by the smallest distance from the antenna and radiating structures or outer surface of the device, according to the host form factor, exposure conditions and platform requirements, to any part of the body or extremity of a user or bystander (see 5) of section 4.1). To qualify for SAR test exclusion, the test separation distances applied must be fully explained and justified by the operating configurations and exposure conditions of the transmitter and applicable host platform requirements, typically in the SAR measurement or SAR analysis report, according to the required published RF exposure KDB procedures. When no other RF exposure testing or reporting is required, a statement of justification and compliance must be included in the equipment approval, in lieu of the SAR report, to qualify for the SAR test exclusion. When required, the device specific conditions described in the other published RF exposure KDB procedures must be satisfied before applying these SAR test exclusion provisions; for example, handheld PTT two-way radios, handsets, laptops & tablets etc.23 “ [(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 Page 2 of 2 Report No.: AIT23033110FH1 • The result is rounded to one decimal place for comparison • 3.0 and 7.5 are referred to as the numeric thresholds in the step 2 below The test exclusions are applicable only when the minimum test separation distance is ≤ 50 mm and for transmission frequencies between 100 MHz and 6 GHz. When the minimum test separation distance is < 5 mm, a distance of 5 mm according to 5) in section 4.1 is applied to determine SAR test exclusion. 4. Manufacturing Tolerance Mode Max. Peak Conducted Output Power (dBm) Max. tune-up BT -1.25 -1±1 5. Standalone MPE Result Antenna 1 Band/Mode f (GHz) Antenna Distance (mm) RF output power including tune up SAR Test Exclusion Threshold SAR Test Exclusion Estimated SAR dBm mW BT 2.5 5 0 1.00 0.316< 3 Yes 0.0422 Note: Only the worst case recorded. 6. Conclusion ： Compliance the RF exposure requirement

Page 1 of 38 Report No.: AIT23033110W1 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. TEST REPORT Client Information: Applicant: DOKE COMMUNICATION (HK) LIMITED Applicant add.: RM 1902 EASEY COMM BLDG 253-261 HENNESSY ROAD WANCHAI HK CHINA Manufacturer: Shenzhen DOKE Electronic Co., Ltd Manufacturer add.: 801, Building3, 7th Industrial Zone, Yulv Community, Yutang Road, Guanaming District, Shenzhen, China Product Information: Product Name: Wireless Earphone Model No AirBuds 4 Brand Name: Blackview FCC ID: 2A7DX-AIRBUDS4 Applicable standards: FCC CFR Title 47 Part 15 Subpart C Section 15.247 Prepared By: Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang,Dongguan, Guangdong, China Tel.: +86-769-8202 0499 Fax.: +86-769-8202 0495 Date of Receipt: Mar. 31,2023 Date of Test: Mar. 31,2023~Apr. 13,2023 Date of Issue: Apr. 14,2023 Test Result: Pass This device described above has been tested by Dongguan Yaxu (AiT) Technology Limited 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. Note: This report shall not be reproduced except in full, without the written approval of Dongguan Yaxu (AiT) Technology Limited, this document may be altered or revised by Dongguan Yaxu (AiT) Technology Limited, personal only, and shall be noted in the revision of the document. This test report must not be used by the client to claim product endorsement. Reviewed by: Approved by: Simba Huang Seal.chen Page 2 of 38 Report No.: AIT23033110W1 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. 1 Contents Page COVER PAGE 1CONTENTS .................................................................................................................................................................... 2 2TEST SUMMARY .......................................................................................................................................................... 4 2.1Statement of the Measurement Uncertainty .............................................................................. 4 2.2Measurement Uncertainty ......................................................................................................... 4 3TEST FACILITY ............................................................................................................................................................. 5 3.1Deviation from standard ............................................................................................................ 5 3.2Abnormalities from standard conditions .................................................................................... 5 3.3Test Location ............................................................................................................................. 5 4GENERAL INFORMATION ......................................................................................................................................... 6 4.1Test frequencies ........................................................................................................................ 7 4.2EUT Peripheral List ................................................................................................................... 8 4.3Test Peripheral List ................................................................................................................... 8 4.4TEST METHODOLOGY............................................................................................................ 9 4.5Description of Test Modes ....................................................................................................... 10 5EQUIPMENT USED DURING TEST ........................................................................................................................ 11 6TEST RESULTS AND MEASUREMENT DATA .................................................................................................... 11 6.1Antenna requirement .............................................................................................................. 12 6.2Peak Power Measurement ...................................................................................................... 13 6.3Frequency Separation and 20 dB Bandwidth .......................................................................... 15 6.4Number of Hopping Frequency ............................................................................................... 17 6.5Time of Occupancy (Dwell Time) ............................................................................................ 17 6.6Conducted Spurious Emissions and Band Edges Test ........................................................... 17 6.7Restrict-band Band-edge Measurements ............................................................................... 22 6.8Radiated Emissions Measurement ......................................................................................... 24 6.9Conducted Emissions ............................................................................................................. 34 6.10Pseudorandom frequency hopping sequence ......................................................................... 37 7TEST SETUP PHOTOGRAPHS OF EUT ................................................................................................................ 38 8EXTERNAL PHOTOGRAPHS OF EUT ................................................................................................................... 38 9INTERNAL PHOTOGRAPHS OF EUT .................................................................................................................... 38 Page 3 of 38 Report No.: AIT23033110W1 Dongguan Yaxu (AiT) Tech…

Text truncated - open the document above for the full version.

SymbolsLWTA Dimensions 1.60±0.200.80±0.200.80±0.200.30±0.10 NumberTerminalName ① INPUT ② NC Dimensions(Unit: mm) w ①② ( Side View) ( Bottom View) ( Top View) A T L HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page1 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 Applications 1.Bluetooth 2.WirelessLAN 3.ISM band 2.4GHz wirelessapplications Features 1.Surfacemounteddeviceswithasmalldimensionof1.6×0.8×0.8mmmeetfutureminiaturization trend. 2.EmbeddedandLTCC(lowtemperatureco-firedceramic)technologyisabletointegratewith systemdesignaswellasbeatifyingthehousingoffinalproduct. 3.Highstabilityandlowtolerance. P/N:HY160808 SRF07 MatchingCircuits P/N:HY160808 SRF07 设计指导： 1、原则上，净空区左侧边缘距离板边的间距W1应该尽量大，且 注意与底部电池的间距。 2、主净空区的宽度W2最优为1.5mm~2.5mm。 3、凹槽的长度L的长度为2mm~5mm。 4、0603天线和0603天线底部的两颗物料可以上下互换位置。 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page2 1 W=2 1 W2=2 1.5 Feeding line (微带线) 2 5 0201/0402 footprint 0603 footprint 0201/0402 footprint 0.5 Unit:mm 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. 2 L=4 W1 Application example-1 P/N:HY160808 SRF07 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page3 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. Application example-2 P/N:HY160808 SRF07 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page4 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. ElectricalCharacteristics CharacteristicCurves FeatureSpecification 1 Centralfrequency2.45GHz&5.5GHz 2 Bandwidth>100MHz 3 Peak gain>3dBi 4 VSWR<2 5 PolarizationLinear 6 AzimuthbeamwidthOmnidirectional 7 Impedance50Ω P/N:HY160808 SRF07 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page5 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. RadiationPattern Y-ZPlane X-ZPlane coordinates： 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page6 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. P/N:HY160808 SRF07 3D RadiationPattern Frequency 2450MHz5500MHz Avg.gain-0.85-1.30 Peakgain3.03.5 Efficiency82%78% 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page7 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. P/N:HY160808 SRF07 Temperature：40±2°C Humidity：90~95%RH Duration：500h Recovery conditions：Room temperature Recovery Time：24h (Class1) or 48h (Class2) Test Temperature Operating Temperature Temperature RelativeHumidity 25°C±3°C -25°C~+85°C 5~40°C 20~70% Notenoughsolder Weak holding forcemay cause bad connection between the chipandPCB. RecommendedSolderingAmounts The optimal solder fillet amounts forre-flowsoldering 天线厚度 以下 The optimal solder fillet amounts for wavesoldering DependabilityTest Too much solder Cracks tend to occur due to large stress. MoistureProof OptimumSolderAmount forReflowSoldering Solderability At least 95% of the terminal electrode is covered by newsolder. Preheating conditions:80 to 120°C;10~30s. Solder Tem p e r at u r e :2 3 5 ±5°C Duration:2 ±0.5s , Solder Tempe r ature:24 5±5°C Du rat ion:2±0.5s 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoanypersonorfirm withoutthepriorwrittenconsentofHanyangAntennaDesignCo.Ltd. Page8 汉阳天线设计有限公司 HanyangAntenna Design Co. Ltd. P/N:HY160808 SRF07 10±1S AppliedForce:5NDuration:10±1S Preheating conditions: up-category temperature, 1h Recovery time:24±1h InitialMeasurement Cycling Times: 5 times, 1 cycle, 4steps: Preheating80to120°C;10~30s.SolderTemperature:235±5°C;Duration:2±0.5s;SolderTemperature:245±5°C Duration:2±0.5s;Preheating100to200°C;10±2min. SolderTemperature:265±5°C;Duration:10±1s Cleanthecapacitorwithsolventandexamineitwitha10X(min.)microscope. RecoveryTime:24±2h Recoverycondition:Roomtemperature Test Board: Al 2 O 3 orPCBWarp:1mm Speed:0.5mm/sec. Unit:mm Themeasurementshouldbemadewiththeboardinthe bendingposition. Resistance to Soldering Heat ResistancetoFlexureofSubstrate Temperature CycleTest 深圳市宝安区前进二路宝运达物流信息大厦12A11 青岛市崂山区松岭路399号海信产业园A1号楼606 电话：0755-23069700 传真：0755-23069700 HanyangAntennaDesignCo.Ltd.haspossessionofproprietaryinformationprovidedinthisreportand thisproprietaryinformationshallbekeptinstrictconfidenceandnotdisclosedtoa…

Text truncated - open the document above for the full version.

Dongguan Yaxu(AiT) Technology Limited Report No.: AIT23033110W1 FCC ID: 2A7DX-AIRBUDS4 Page 1 of 42 Appendix A RF Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: Wireless Earphone Trade Mark: Blackview Test Model: AirBuds 4 Environmental Conditions Temperature: 25.9°C Relative Humidity: 52.1% ATM Pressure: 101Kpa Test Engineer: Simba Huang Supervised by: Seal Chen Dongguan Yaxu(AiT) Technology Limited Report No.: AIT23033110W1 FCC ID: 2A7DX-AIRBUDS4 Page 2 of 42 Contents Page COVER PAGE 1 Duty Cycle ........................................................................................................................................................................................... 3 1.1 Test Result ............................................................................................................................................................................... 3 1.2 Test Graphs ............................................................................................................................................................................. 4 2 Maximum Conducted Peak Output Power .......................................................................................................................................... 7 2.1 Test Result ............................................................................................................................................................................... 7 2.2 Test Graphs ............................................................................................................................................................................. 8 3 20dB Bandwidth ................................................................................................................................................................................ 11 3.1 Test Result ............................................................................................................................................................................. 11 3.2 Test Graphs ........................................................................................................................................................................... 12 4 Carrier Frequency Separation ........................................................................................................................................................... 15 4.1 Test Result ............................................................................................................................................................................. 15 4.2 Test Graphs ........................................................................................................................................................................... 16 5 Hopping Channel Number ................................................................................................................................................................. 17 5.1 Test Result ............................................................................................................................................................................. 17 5.2 Test Graphs ........................................................................................................................................................................... 18 6 Dwell Time ......................................................................................................................................................................................... 19 6.1 Test Result ............................................................................................................................................................................. 19 6.2 Test Graphs ........................................................................................................................................................................... 20 7 RF Conducted Spurious Emissions ................................................................................................................................................... 22 7.1 Test Result ............................................................................................................................................................................. 22 7.2 Test Graphs ........................................................................................................................................................................... 23 8 Band-edge for RF Conducted Emissions .......................................................................................................................................... 29 8.1 Test Result ............................................................................................................................................................................. 29 8.2 Test Graphs ........................................................................................................................................................................... 30 9 Restrict-band band-edge measurements .......................................................................................................................................... 38 9.1 Test Result ............................................................................................................................................................................. 38 9.2 Test Graphs ........................................................................................................................................................................... 39 Dongguan Yaxu(AiT) Technology Limited Report No.: AIT23033110W1 FCC ID: 2A7DX-AIRBUDS4 Page 3 of 42 1 Duty Cycle 1.1 Test Result Mode Frequency (MHz) Duty Cycle (%) 1/T (kHz) 1-DH1 2402 32 2.56 1-DH1 2441 31.2 2.63 1-DH1 2480 31.21 2.63 2-DH1 2402 32 2.56 2-DH1 2441 32.6 2.56 2-DH1 2480 32.01 2.56 Dongguan Yaxu(AiT) Techno…

Text truncated - open the document above for the full version.

Page 1 of 2 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Test Setup Photo Radiated Emission Page 2 of 2 FCC ID: 2A7DX-AIRBUDS4 Dongguan Yaxu (AiT) Technology Limited No.22, Jinqianling 3rd Street, Jitigang, Huangjiang, Dongguan, Guangdong, China. Conducted Emission ------End------