2AM73-0006Wireless DJ Headphones

Rev 1/26/2023 AlphaTheta Corporation Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 10-29-2025 Ref: Attestation Statements Part 2.911(d)(5)(i) Filing FCC ID: 2AM73-0006 AlphaTheta Corporation (“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. AlphaTheta Corporation (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Device is inherently compliant based on hardware limitations or software controls. or A Software Bill of Materials (SBOM) is provided to the TCB for review, and The end-user or third parties cannot install additional software on this device. Sincerely, (Applicant signature) (Applicant printed name) Hiroaki Yoshida Rev 1/26/2023 AlphaTheta Corporation Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 10-29-2025 Ref: Attestation Statements Part 2.911(d)(5)(ii) Filing FCC ID: 2AM73-0006 AlphaTheta Corporation (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. Sincerely, (Applicant signature) (Applicant printed name) Hiroaki Yoshida

AlphaTheta Corporation U.S. Agent Designation for Service of Process - Certification Attestation Letter 10/29/2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID:2AM73-0006 FCC Registration Number (FRN): 0030197354 Per section 2.911(d)(7) of the FCC rules, AlphaTheta Corporation (“the applicant”) certifies that the equipment for which authorization is sought is designated to the following U.S. agent* for service of process: Company Name: Global Product Services and Consultation LLC FCC Registration Number (FRN): 0033406703 Physical U.S. Company Address: 328 W Palm Ave. Monrovia, CA91016 Contact Person: Michael Chan Agent Email Address: [email protected] Contact Phone: (626) 366-4358 The above contact person accepts the obligation for service of process. The applicant 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. Applicant Signed: Agent Signed (if different from Applicant): Signed: Signed: Company Representative: Hiroaki Yoshida/Manager Company: AlphaTheta Corporation Date: 10/29/2025 Designated Agent Representative: Michael Chan Designated Agent: Global Product Services and Consultation LLC Date: 11/06/2025 SC5119320

AlphaTheta Corporation Date: 2025-10-29 To: Federal Communications Commission 7435 Oakland Mills Road Columbia, MD FCC ID: 2AM73-0006 To Whom It May Concern: This letter is to ascertain that AlphaTheta Corporation EUT：Wireless DJ Headphones MODEL No.: HDJ-F9 Has been the units used for conducting FCC compliance testing, the SDoC part will be tested by EMTEK (SHENZHEN) CO., LTD. If you have any question or concerns, pls. contact us. Sincerely, Client’s signature ： Client’s name / title ： Hiroaki Yoshida / Manager Contact information / address: AlphaTheta Corporation /6F, Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku, Yokohama, Kanagawa 220-0012 JAPAN

RF_160, Issue 03 Declaration of Authorization We Name: AlphaTheta Corporation Address: 6F, Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku, Yokohama, Kanagawa 220-0012 JAPAN City: Yokohama State or Country: Japan Declare that: Name Representative of agent: Lisa Wang (1) Agent Company name: EMTEK (SHENZHEN) CO., LTD. Address: Bldg 69, Majialong Industry Zone, Nanshan District, City: Shenzhen Country China is authorized to apply for Certification of the following product(s): Product description: Wireless Monitor Headphones system Type designation: HDJ-F9 Trademark: AlphaTheta FCC ID: 2AM73-0006 on our behalf. Date: 2025-10-29 Name: Hiroaki Yoshida Function: Manager Signature: Notes: (1): Required for FCC application (2): For FCC it must be the Grantee Code “owner” or the authorized agent.

FCC, Request for non-disclosure Date: 16-Jul-10 RF_501, Issue 6 Page 1 of 1 Company Name: AlphaTheta Corporation Address: 6F, Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku, Yokohama, Kanagawa 220-0012 JAPAN City: Yokohama Country: JAPAN To: Telefication B.V., Dept. FCC TCB Edisonstraat 12A 6902 PK ZEVENAAR The Netherlands Subject: Request for confidentiality FCC ID: 2AM73-0006 Reference number: ###### Dear FCC TCB, 1. Long-Term Confidentiality Pursuant to 47 CFR Section 0.459(a) & (b), we hereby requests non-disclosure and confidential treatment of the following materials submitted in support of FCC certification application: Bill(s) of Material Block Diagrams Operational Description Schematic Diagrams Tune-up Procedure Above materials contain secrets, proprietary and technical information, which would customarily be guarded from competitors under 47 CFR, section 0.457(d)(2). Disclosure or publication or any portion of this company confidential material to other parties could cause substantial competitive harm and provide unjustified benefits for competitors. 2. Short-Term Confidentiality (STC) Pursuant to Public Notice DA 04-1705 of the Commission’s policy, in order to comply with the marketing regulations in 47 CFR §2.803 and the importation rules in 47 CFR §2.1204, applicant hereby requests Short-Term Confidential treatment of the following materials (note 1): Internal Photos User’s Manual Test Set-up Photos External Photos Justification: The product is not on the market yet Planned Release Date STC: 2026-02-17 (notes 2, 3, 4, 5) Date: 2025-10-29 Name and signature of applicant: Notes: 1) A document or type of document can only have ONE type of confidentiality! 2) Short-Term confidentiality is in principle for 45 days from date of grant; it can be extended max 3 times (total time 180 days max.)! 3) FCC must be informed when marketing begins earlier. 4) Release takes place automatically thus extension must be requested in time. Telefication does not remind you of this! 5) Request for extension or for release must be received by Telefication at least 7 days before date of actual marketing or before expiration of the STC period

Test Laboratory: Shenzhen EMTEKCo.,Ltd.Date: 2025/9/1 System Check_H2450 DUT: Dipole 2450 MHz; Type:D2450V2; SN:927 Communication System: CW; Frequency: 2450 MHz;Duty Cycle: 1:1 Medium: H2450 Medium parameters used: f = 2450 MHz;σ=1.76S/m;ε r =40.14;ρ=1000kg/m 3 AmbientTemperature：22.1°C; LiquidTemperature：21.9°C DASY5 Configuration: - Probe: EX3DV4 - SN3970; Calibrated: 2025/6/5; - Electronics: DAE4 Sn1418; Calibrated: 2025/6/5 - Phantom: SAM; Type: QD000P40CD; Serial: TP:1794 - Measurement SW: DASY52, Version 52.10 (4); SEMCAD X Version 14.6.14 (7501) Pin=250mW/Area Scan (61x61x1):Interpolated grid: dx=1.500 mm, dy=1.500 mm Maximum value of SAR (interpolated) = 22.0 W/kg Pin=250mW/Zoom Scan (5x5x7)/Cube 0:Measurement grid: dx=5mm, dy=5mm, dz=5mm Reference Value = 8.957 V/m; Power Drift = 0.12 dB Peak SAR (extrapolated) = 30.8 W/kg SAR(1 g) = 13.11 W/kg; SAR(10 g) = 6.12 W/kg Maximum value of SAR (measured) = 21.2 W/kg

Test Laboratory: Shenzhen EMTEK Co.,Ltd.Date: 2025/9/1 BT DUT: HDJ-F9 Communication System: BT ; Frequency: 2480 MHz;Duty Cycle: 1:1 Medium: H2450 Medium parameters used: f = 2480 MHz;σ=1.63S/m;ε r = 40.11;ρ=1000kg/m 3 AmbientTemperature：22.1°C; LiquidTemperature：21.9°C DASY5 Configuration: - Probe: EX3DV4 - SN3970; Calibrated: 2025/6/5; - Electronics: DAE4 Sn1418; Calibrated: 2025/6/5 - Phantom: SAM; Type: QD000P40CD; Serial: TP:1794 - Measurement SW: DASY52, Version 52.10 (4); SEMCAD X Version 14.6.14 (7501) Back-3DH5 High/Area Scan (6x7x1):Measurement grid: dx=10mm, dy=10mm Maximum value of SAR (measured) = 0.308 W/kg Back-3DH5 High/Zoom Scan (5x5x7)/Cube 0:Measurement grid: dx=5mm, dy=5mm, dz=5mm Reference Value = 7.918 V/m; Power Drift = -0.12 dB Peak SAR (extrapolated) = 1.53 W/kg SAR(1 g) = 0.650 W/kg; SAR(10 g) = 0.288 W/kg Smallest distance from peaks to all points 3 dB below = 4.8 mm Ratio of SAR at M2 to SAR at M1 = 47.4% Maximum value of SAR (measured) = 1.11 W/kg Test Laboratory: Shenzhen EMTEK Co.,Ltd.Date: 2025/9/1 SRD2.4 Ant1 DUT: HDJ-F9 Communication System: BT; Frequency: 2402 MHz;Duty Cycle: 1:1 Medium: H2450 Medium parameters used: f = 2402 MHz;σ=1.70S/m;ε r =40.18;ρ=1000kg/m 3 AmbientTemperature：22.1°C; LiquidTemperature：21.9°C DASY5 Configuration: - Probe: EX3DV4 - SN3970; Calibrated: 2025/6/5; - Electronics: DAE4 Sn1418; Calibrated: 2025/6/5 - Phantom: SAM; Type: QD000P40CD; Serial: TP:1794 - Measurement SW: DASY52, Version 52.10 (4); SEMCAD X Version 14.6.14 (7501) Right-Low/Area Scan (6x7x1):Measurement grid: dx=10mm, dy=10mm Maximum value of SAR (measured) = 0.134 W/kg Right-Low/Zoom Scan (5x5x7)/Cube 0:Measurement grid: dx=5mm, dy=5mm, dz=5mm Reference Value = 15.40 V/m; Power Drift = -0.14 dB Peak SAR (extrapolated) = 0.796 W/kg SAR(1 g) = 0.329 W/kg; SAR(10 g) = 0.128 W/kg Smallest distance from peaks to all points 3 dB below = 4.8 mm Ratio of SAR at M2 to SAR at M1 = 48.4% Maximum value of SAR (measured) = 0.494 W/kg Test Laboratory: Shenzhen EMTEK Co.,Ltd.Date: 2025/9/1 SRD2.4 Ant2 DUT: HDJ-F9 Communication System:BT; Frequency: 2441 MHz;Duty Cycle: 1:1 Medium: H2450 Medium parameters used: f = 2441 MHz;σ=1.75S/m;ε r =40.16;ρ=1000kg/m 3 AmbientTemperature：22.1°C; LiquidTemperature：21.9°C DASY5 Configuration: - Probe: EX3DV4 - SN3970; Calibrated: 2025/6/5; - Electronics: DAE4 Sn1418; Calibrated: 2025/6/5 - Phantom: SAM; Type: QD000P40CD; Serial: TP:1794 - Measurement SW: DASY52, Version 52.10 (4); SEMCAD X Version 14.6.14 (7501) Back-Middle/Area Scan (6x7x1):Measurement grid: dx=10mm, dy=10mm Maximum value of SAR (measured) = 0.107 W/kg Back-Middle/Zoom Scan (5x5x7)/Cube 0:Measurement grid: dx=5mm, dy=5mm, dz=5mm Reference Value = 16.01 V/m; Power Drift = -0.06 dB Peak SAR (extrapolated) = 0.736 W/kg SAR(1 g) = 0.209 W/kg; SAR(10 g) = 0.112 W/kg Smallest distance from peaks to all points 3 dB below = 4.8 mm Ratio of SAR at M2 to SAR at M1 = 47.7% Maximum value of SAR (measured) = 0.523 W/kg

Report No.ENS2507180234W01805R Page 1 of 36 Ver.1.0 TEST REPORT Product Name : Wireless DJ Headphones Model Number : HDJ-F9 FCC ID : 2AM73-0006 Prepared for : AlphaTheta Corporation Address : 6F, Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku, Yokohama, Kana gawa 220-0012 JAPAN Prepared by : EMTEK (SHENZHEN) CO., LTD. Address : Bldg 69, Majialong Industry Zone, Nanshan District, Shenzhen, Guan gdong, China Tel: (0755) 26954280 Fax: (0755) 26954282 Report Numbe r : ENS2507180234W01805R Date(s) of Tests : September 1, 2025 to September 1, 2025 Date of Issue : September 2, 2025 $二维码$ Report No.ENS2507180234W01805R Page 2 of 36 Ver.1.0 TABLE OF CONTENTS 1. TEST RESULT CERTIFICATION ............................................................................................................................ 4 2. DESCRIPTION OF EQUIPMENT UNDER TEST ..................................................................................................... 6 3. SAR MEASUREMENT SYSTEM ............................................................................................................................. 7 3.1 DEFINITION OF SPECIFIC ABSORPTION RATE (SAR) ............................................................................... 7 3.2 SPEAG DASY SYSTEM .................................................................................................................................. 7 3.2.1 ROBOT ............................................................................................................................................... 8 3.2.2 PROBES ............................................................................................................................................. 9 3.2.3 DATA ACQUISITION ELECTRONICS (DAE) ..................................................................................... 9 3.2.4 PHANTOMS ..................................................................................................................................... 10 3.2.5 DEVICE HOLDER ............................................................................................................................ 11 3.2.6 SYSTEM VALIDATION DIPOLES .................................................................................................... 11 3.2.7 TISSUE SIMULATING LIQUIDS ...................................................................................................... 12 3.3 SAR SYSTEM VERIFICATION ...................................................................................................................... 14 3.4 SAR MEASUREMENT PROCEDURE ........................................................................................................... 15 3.4.1 AREA & ZOOM SCAN PROCEDURE .............................................................................................. 15 3.4.2 VOLUMESCAN PROCEDURE ........................................................................................................ 15 3.4.3 POWER DRIFT MONITORING ........................................................................................................ 16 3.4.4 SPATIAL PEAK SAR EVALUATION ................................................................................................. 16 3.4.5 SAR AVERAGED METHODS .......................................................................................................... 16 4. SARMEASUREMENT EVALUATION ................................................................................................................... 17 4.1 APPLICABLE STANDARDS .......................................................................................................................... 17 4.2 EUT TESTING POSITION ............................................................................................................................. 17 4.2.1 HEAD&BODY EXPOSURE CONDITIONS ...................................................................................... 17 4.2.1 SAR TEST EXCLUSION EVALUATIONS ........................................................................................ 19 4.3 TISSUE VERIFICATION ................................................................................................................................ 21 4.4 SYSTEM VALIDATION ................................................................................................................................... 21 4.5 SYSTEM VERIFICATION ............................................................................................................................... 22 4.6 MAXIMUM OUTPUT POWER ....................................................................................................................... 23 4.6.1 MAXIMUM CONDUCTED POWER ................................. ................................................................ 23 4.6.2 MEASURED CONDUCTED POWER RESULT ............................................................................... 24 4.7 SAR TESTING RESULTS .............................................................................................................................. 25 4.7.1 SAR TEST REDUCTION CONSIDERATIONS ................................................................................ 25 4.7.2 SAR RESULTS FOR HEAD EXPOSURE CONDITION ................................................................... 26 4.7.3 ESTIMATED SAR CALCULATION ................................................................................................... 27 5. CALIBRATION OF TEST EQUIPMENT ................................................................................................................ 28 6. MEASUREMENT UNCERTAINTY ......................................................................................................................... 29 7. INFORMATION ON THE TESTING LABORATORIES ......................................................................................... 32 APPENDIX A.SAR PLOTS OF SYSTEM VERIFICATION APPENDIX B.SAR PLOTS OF SAR…

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

深圳市丰禾原电子科技有限公司 SUNITECENTERPRISECO.,LTD. 1 ANTENNASPECIFICATION Project： CH6370B-ANT1 Version： V1.0 IssuedDate： 2025.08.19 Testedby： Lite.Mo Checkby： Xun.Li Manufacturer： SunitecEnterpriseCo.,LTD. THISDRAWINGSANDSPECIFICATIONSARETHEPROPERTYOFSUNITEC ENTERPRISECO.,LTD.ANDSHALLNOTBEREPRODUCEDORUSEDAS THEBASISFORTHEMANUFACTUREORSALEOFAPPARATUSOR DEVICESWITHOUTPERMISSION 2 Contents 1.RevisionHistory 2.Introduction 3.ElectricalCharacteristics THISDRAWINGSANDSPECIFICATIONSARETHEPROPERTYOFSUNITEC ENTERPRISECO.,LTD.ANDSHALLNOTBEREPRODUCEDORUSEDAS THEBASISFORTHEMANUFACTUREORSALEOFAPPARATUSOR DEVICESWITHOUTPERMISSION 3 1.RevisionHistory Rev.NoIssuedDateDescriptionSummary V1.02025.08.19initialrelease 2.Introduction 2.1IntroductionofProduct ThisproductisaBluetoothantennawithLayoutonPCB 2.2Dimension 3.ElectricalCharacteristics 3.1Testequipment: EquipmentManufacturerModelNoSerialNo. LastCal.DueDate VECTOR NETWORK ANALYZER AgilentE5071C2024.10.232025.10.22 Antenna Measurement System ETS-Lindgren AMS-80502024.10.232025.10.22 ETS-Lindgren EMCenter ModularRF Platform 2024.10.232025.10.22 THISDRAWINGSANDSPECIFICATIONSARETHEPROPERTYOFSUNITEC ENTERPRISECO.,LTD.ANDSHALLNOTBEREPRODUCEDORUSEDAS THEBASISFORTHEMANUFACTUREORSALEOFAPPARATUSOR DEVICESWITHOUTPERMISSION 4 3.2AntennaS11parameters 3.3AntennaTestSettings: THISDRAWINGSANDSPECIFICATIONSARETHEPROPERTYOFSUNITEC ENTERPRISECO.,LTD.ANDSHALLNOTBEREPRODUCEDORUSEDAS THEBASISFORTHEMANUFACTUREORSALEOFAPPARATUSOR DEVICESWITHOUTPERMISSION 5 3.43DRadiationPattern: 3.5ElectricalCharacteristics: AntennatypePCBLayoutAntenna WorkingFrequencyRange 2450±50MHz Impedance50Ω VSWR<2 MaxEfficiency(%)48.7%@2430MHz MaxpeakGain(dBi)2.38dBi@2420MHz PolarizationLinear

1 天 线 规 格 书 项目名称： CH-6370B 天线名称： BT 天线 天线类型： dipole 天线制造商名称： 深圳市思讯通信技术有限公司 天线制造商地址： 深圳市宝安区创业二路东联大厦 A 座 505-506 规格书版本号： V1.0 日期： 2025.08.15 2 目录 一：无源测试报告 ................................................................................................................................................................... 3 二：天线3D暗室数据 ............................................................................................................................................................ 6 三：天线匹配电路 ................................................................................................................................................................... 7 四：天线结构图档 ................................................................................................................................................................... 8 变更记录栏 编制/变更日期 变更理由 变更内容 版本 2025.08.15 初版发行 初版发行 V1.0 3 一：无源测试报告 Angilent E5071C 天线 S11 参数： 4 天线效率和增益： 2400-2480 MHz Frequency （MHz） Efficiency (dB ) Gain (dBi) Efficiency （%） 2400 -3.8 -0.3 42.2 2410 -3.6 -0.3 43.6 2420 -3.5 -0.3 45.0 2430 -3.6 -0.3 43.8 2440 -3.7 -0.1 42.4 2450 -3.6 0.3 43.5 2460 -3.7 0.5 42.4 2470 -3.6 0.9 44.2 2480 -3.4 1.1 45.7 AVG -3.6 0.2 43.6 天线 3D 方向图： 5 天线 2D 方向图： Theta=90.00deg Phi=0.00deg 6 Phi=90.00deg 二：天线3D暗室数据 自由 Channel TRP（dBm） TIS（dBm） CH 0 7.1 -93.3 CH 39 7.3 -93.6 CH 78 6.8 -92.9 头模 Channel TRP（dBm） TIS（dBm） CH 0 5.5 -91.5 CH 39 5.2 -91.7 CH 78 4.8 -91.3 OTA Standard Chamber 7 三：天线匹配电路 8 四：天线结构图档

Report No. ENS2507180234W01801R Page 1 of 73 Ver.1.0 TEST REPORT Product Name ： Wireless DJ Headphones Model Number ： HDJ-F9 FCC ID ：2AM73-0006 Prepared for : AlphaTheta Corporation Address : 6F, Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku, Yokohama, Kana gawa 220-0012 JAPAN Prepared by : EMTEK (SHENZHEN) CO., LTD. Address : Bldg 69, Majialong Industry Zone, Nanshan District, Shenzhen, Guangdong, China Tel: (0755) 26954280 Fax: (0755) 26954282 Report Numbe r : ENS2507180234W01801R Date(s) of Tests : July 19, 2025 to September 11, 2025 Date of Issue : September 12, 2025 $二维码$ Report No. ENS2507180234W01801R Page 2 of 73 Ver.1.0 TABLE OF CONTENTS 1 TEST RESULT CERTIFICATION ............................................................................................................ 3 2 EUT TECHNICAL DESCRIPTION .......................................................................................................... 5 3 SUMMARY OF TEST RESULT ............................................................................................................... 6 4 TEST METHODOLOGY .......................................................................................................................... 7 4.1 GENERAL DESCRIPTION OF APPLIED STANDARDS .................................................................. 7 4.2 MEASUREMENT EQUIPMENT USED ............................................................................................ 7 4.3 DESCRIPTION OF TEST MODES ................................................................................................... 8 5 FACILITIES AND ACCREDITATIONS ..................................................................................................... 9 5.1 FACILITIES ....................................................................................................................................... 9 5.2 LABORATORY ACCREDITATIONS AND LISTINGS ....................................................................... 9 6 TEST SYSTEM UNCERTAINTY ........................................................................................................... 10 7 SETUP OF EQUIPMENT UNDER TEST .............................................................................................. 11 7.1 RADIO FREQUENCY TEST SETUP 1 .......................................................................................... 11 7.2 RADIO FREQUENCY TEST SETUP 2 .......................................................................................... 11 7.3 CONDUCTED EMISSION TEST SETUP ....................................................................................... 13 7.4 BLOCK DIAGRAM CONFIGURATION OF TEST SYSTEM .......................................................... 14 7.5 SUPPORT EQUIPMENT ................................................................................................................ 14 8 FREQUENCY HOPPING SYSTEM REQUIREMENTS ........................................................................ 15 8.1 STANDARD APPLICABLE ............................................................................................................. 15 8.2 EUT PSEUDORANDOM FREQUENCY HOPPING SEQUENCE ................................................. 15 8.3 EQUAL HOPPING FREQUENCY USE .......................................................................................... 16 8.4 FREQUENCY HOPPING SYSTEM ............................................................................................... 16 9 TEST REQUIREMENTS ....................................................................................................................... 17 9.1 20DB BANDWIDTH ........................................................................................................................ 17 9.2 CARRIER FREQUENCY SEPARATION ........................................................................................ 21 9.3 NUMBER OF HOPPING FREQUENCIES ..................................................................................... 23 9.4 AVERAGE TIME OF OCCUPANCY (DWELL TIME) ...................................................................... 25 9.5 MAXIMUM PEAK CONDUCTED OUTPUT POWER ..................................................................... 32 9.6 CONDUCTED SUPRIOUS EMISSION .......................................................................................... 39 9.7 RADIATED SPURIOUS EMISSION ............................................................................................... 55 9.8 CONDUCTED EMISSION TEST .................................................................................................... 69 9.9 ANTENNA APPLICATION .............................................................................................................. 72 Report No. ENS2507180234W01801R Page 3 of 73 Ver.1.0 1 TEST RESULT CERTIFICATION Applicant : AlphaTheta Corporation Address : 6F, Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku, Yokohama, Kanagawa 220-0012 JAPAN Manufacturer : AlphaTheta Corporation Address : 6F, Yokohama i-Mark Place, 4-4-5 Minatomirai, Nishi-ku, Yokohama, Kanagawa 220-0012 JAPAN EUT : Wireless DJ Headphones Model Name : HDJ-F9 Trademark : AlphaTheta Measurement Procedure Used: APPLICABLE STANDARDS STANDARD TEST RESULT FCC 47 CFR Part 2, Subpart J FCC 47 CFR Part 15, Subpart C PASS The above equipment was tested by EMTEK (SHENZHEN) CO., LTD. The test data, data evaluation, test procedures, and equipment configurations shown in this report were made in accordance with the procedures given in ANSI C63.10 (2020) and the energy emitted by the sample EUT tested as described in this report is in compliance with the requirements of FCC Rules Part 2 and Part 15.247 The test results of this report relate only to the tested sample identified in this report. Date of Test : Jul y 19, 2025 to September 11, 2025 Prepared b y : Una Yu/Editor Reviewer : Joe Xia/Supervisor Approved & Authorized Signer : Lisa Wan g/Manager Report No. ENS25…

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

Report No. ENS2507180234W01801R Page 32 of 73 Ver.1.0 9.5 MAXIMUM PEAK CONDUCTED OUTPUT POWER 9.5.1 Applicable Standard According to FCC Part 15.247(b)(1) and KDB 558074 D01 15.247 MEAS GUIDANCE v05r02 9.5.2 Conformance Limit The max For frequency hopping systems operating in the 2400-2483.5 MHz band employing at least 75 non-overlapping hopping channels: 1 watt. For all other frequency hopping systems in the 2400-2483.5 MHz band: 0.125 watts. 9.5.3 Test Configuration Test according to clause 7.1 radio frequency test setup 1 9.5.4 Test Procedure  According to FCC Part15.247(b)(1) As an alternative to a peak power measurement, compliance with the limit can be based on a measurement of the maximum conducted output power. Use the following spectrum analyzer settings: Set Span = approximately 5 times the 20 dB bandwidth, centered on a hopping channel (about 10MHz) Set RBW > the 20 dB bandwidth of the emission being measured (about 3MHz) Set VBW ≥ RBW Set Sweep = auto Set Detector function = peak Set Trace = max hold Allow the trace to stabilize. Use the marker-to-peak function to set the marker to the peak of the emission to determine the peak amplitude level. Test Results Temperature: 25° C Relative Humidity: 45% ATM Pressure: 1011 mbar Test Mode Antenna Frequency[MHz] Conducted Peak Powert[dBm] Conducted Limit[dBm] Verdict DH5 Ant1 2402 8.34 ≤20.97 PASS DH5 Ant1 2441 8.22 ≤20.97 PASS DH5 Ant1 2480 8.43 ≤20.97 PASS 2DH5 Ant1 2402 8.30 ≤20.97 PASS 2DH5 Ant1 2441 8.20 ≤20.97 PASS 2DH5 Ant1 2480 8.42 ≤20.97 PASS 3DH5 Ant1 2402 8.36 ≤20.97 PASS 3DH5 Ant1 2441 8.29 ≤20.97 PASS 3DH5 Ant1 2480 8.49 ≤20.97 PASS Report No. ENS2507180234W01801R Page 33 of 73 Ver.1.0 DH5-Ant1-2402-PASS DH5-Ant1-2441-PASS DH5-Ant1-2480-PASS Report No. ENS2507180234W01801R Page 34 of 73 Ver.1.0 2DH5-Ant1-2402-PASS 2DH5-Ant1-2441-PASS 2DH5-Ant1-2480-PASS Report No. ENS2507180234W01801R Page 35 of 73 Ver.1.0 3DH5-Ant1-2402-PASS 3DH5-Ant1-2441-PASS 3DH5-Ant1-2480-PASS Report No. ENS2507180234W01801R Page 36 of 73 Ver.1.0 DH5-Ant1-2402-PASS DH5-Ant1-2441-PASS DH5-Ant1-2480-PASS Report No. ENS2507180234W01801R Page 37 of 73 Ver.1.0 2DH5-Ant1-2402-PASS 2DH5-Ant1-2441-PASS 2DH5-Ant1-2480-PASS Report No. ENS2507180234W01801R Page 38 of 73 Ver.1.0 3DH5-Ant1-2402-PASS 3DH5-Ant1-2441-PASS 3DH5-Ant1-2480-PASS Report No. ENS2507180234W01801R Page 39 of 73 Ver.1.0 9.6 CONDUCTED SUPRIOUS EMISSION 9.6.1 Applicable Standard According to FCC Part 15.247(d) and KDB 558074 D01 15.247 MEAS GUIDANCE v05r02 9.6.2 Conformance Limit According to FCC Part 15.247(d): In any 100 kHz bandwidth outside the frequency band in which the spread spectrum intentional radiator is operating, the radio frequency power that is produced by the intentional radiator shall be at least 20 dB below that in the 100 kHz bandwidth within the band that contains the highest level of the desired power, based on either an RF conducted, provided the transmitter demonstrates compliance with the peak conducted power limits. 9.6.3 Test Configuration Test according to clause 7.1 radio frequency test setup 1 9.6.4 Test Procedure The transmitter output (antenna port) was connected to the spectrum analyzer  Reference level measurement Establish a reference level by using the following procedure: Set instrument center frequency to DSS channel center frequency. Set Span = approximately 5 times the 20 dB bandwidth, centered on a hopping channel. Set the RBW = 100 kHz. Set the VBW ≥ 3 x RBW. Set Detector = peak. Set Sweep time = auto couple. Set Trace mode = max hold. Allow trace to fully stabilize. Use the peak marker function to determine the maximum Maximum conduceted level. Note that the channel found to contain the maximum conduceted level can be used to establish the reference level.  Band-edge Compliance of RF Conducted Emissions Use the following spectrum analyzer settings: Span = wide enough to capture the peak level of the emission operating on the channel closest to the band-edge, as well as any modulation products which fall outside of the authorized ba…

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