2AHTV-SKYRINGEBluetooth Headphone

UI Operation Instructions classificationTest itemsFunction RequirementsVoice promptsLED display headphones Female voice prompt.Power onBlue light stays on for 3 seconds Power on Long press the power button for 3 seconds to turn on. Power offRed light stays on for 3 seconds Power off Long press the power button for 3 seconds to turn off. Pairing Red and blue lights flash alternately Bluetooth connection Long press the power button for 5 seconds to enter pairing mode. If Bluetooth is not connected, the device will automatically shut down after 15 minutes. Connected Blue light slowly flashes with breathing effect Bluetooth connection s/// Long-range disconnec If no device is connected, the device will automatically shut down after 15 minutes. /Blue light flashes slowly Play/Pause During music playback, a single click of the power button can be used to play/pause. / Blue light slowly flashes with breathing effect Volume up Press and hold the volume + button until the desired volume is reached, the volume will be synchronized with the phone, and the device will remember the last used volume. High-pitched and short sound prompt when the volume is at maximum / Volume down Press and hold the volume - button until the desired volume is reached, the volume will be synchronized with the phone, and the device will remember the last used volume. High-pitched and short sound prompt when the volume is at minimum / headphones Charging During charging, the device will automatically shut down (charging current is 350mA). /Red light stays on Fully charged//Blue light stays on Low battery alert When the battery voltage is below 3.3V, the device will automatically shut down. Battery LowRed light flashes slowly Auto power off due to l b When the battery voltage is below 3.0V, the device will automatically shut down. Power offRed light on for 2 seconds Clear pairing recordsDuring charging, press and hold the volume - ./Blue light flickers DUT mode. While in pairing mode, simultaneously press and hold the volume +/- button to enter DUT mode. Press and hold the power button to exit DUT mode. / Red and blue lights stay on continuously FCC Caution： This 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. Any Changes or modifications not expressly approved by the party responsible for compliance 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 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. The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Shenzhen Skyringe Electronic Technology Co., Ltd. 2023.06.16 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: 2AHTV-SKYRINGE Shenzhen Skyringe Electronic Technology Co., Ltd. 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, Applicant signature: Applicant printed name: Zhou Zhi / Manager Shenzhen Skyringe Electronic Technology Co., Ltd. 2023.06.16 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: 2AHTV-SKYRINGE Shenzhen Skyringe Electronic Technology Co., Ltd. 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, Applicant signature: Applicant printed name: Zhou Zhi / Manager

Shenzhen Skyringe Electronic Technology Co., Ltd. 2023.06.16 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Bluetooth Headphone MODEL : BKM400, T711, T720, T710, T701, BKM200, BKM300, BKM500, BKM600, BKM700, T711TV FCC ID: 2AHTV-SKYRINGE 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 - Schematics - Operational Description 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, Client’s signature: Client’s name / title : Zhou Zhi / Manager Contact information / address: No.7 Tengfeng Avenue, D Building, Pioneer Park, 3rd Industrial Zone, Fenghuang Village, Fuyong Town, Baoan District, shenzhen, Guangdong, China

Shenzhen Skyringe Electronic Technology Co., Ltd. 2023.06.16 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Shenzhen BCTC Testing 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, Client’s signature: Client’s name / title : Zhou Zhi / Manager Contact information / address: No.7 Tengfeng Avenue, D Building, Pioneer Park, 3rd Industrial Zone, Fenghuang Village, Fuyong Town, Baoan District, shenzhen, Guangdong, China

Shenzhen Skyringe Electronic Technology Co., Ltd. Model Difference EUT NAME: Bluetooth Headphone MODEL : BKM400, T711, T720, T710, T701, BKM200, BKM300, BKM500, BKM600, BKM700, T711TV FCC ID: 2AHTV-SKYRINGE All the model are the same circuit and RF module, except model names and color. Regards Sincerely Client’s signature: Client’s name / title : Zhou Zhi / Manager Contact information / address: No.7 Tengfeng Avenue, D Building, Pioneer Park, 3rd Industrial Zone, Fenghuang Village, Fuyong Town, Baoan District, shenzhen, Guangdong, China

External Photos

10*5mm Label Location FCC ID: 2AHTV-SKYRINGE

Internal Photos Antenna

FCC ID: 2AHTV-SKYRINGE Portable device According to §15.247(e)(i) and §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 KDB447498 D01 General RF Exposure Guidance V06 The 1-g SAR and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)]·[√f(GHZ)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR, where: • f(GHZ) is the RF channel transmit frequency in GHz • Power and distance are rounded to the nearest mW and mm before calculation • The result is rounded to one decimal place for comparison When the minimum test separation distance is < 5 mm, a distance of 5 mm is applied to determine SAR test exclusion. Modulation Channel Freq. (GHz) Conduct ed power (dBm) Conducte d power (mW) Tune-up power (dBm) Max tune-up power (dBm) Max tune-up power (mW) Distance (mm) Result calculatio n SAR Exclusion threshold SAR test exclusion GFSK2.441 1.53 1.421±12.001.58<50.495243.00YES π/ 4 DQPSK 2.441 -0.72 0.850±11.001.26<50.393383.00YES 8DPSK2.441-0.120.970±11.001.26<50.393383.00YES Conclusion: For the max result : 0.49524＜3, the SAR testing is not required.

1 ShenzhenYingfengAntennaTechnologyCo.,Ltd On-boardantenna TestReport client Coremicro productOn-boardantenna engineer tim telephone 18676795687 postbox [email protected] date 2023-03-18 2 Reportdirectory >testingfacility >Sampleappearance >Matchingparameters >NetworkpointsdebuggingantennaSparameters >Microwavedarkchambertotesttheantennaefficiency fieldtype >Commissioningsummary 3 3 testcondition ·1.S-parametermeasurement ·2.Equipment:networkanalyzer(AgilentE5062A),microwavedarkroom, MT8852B ·3.Project:Impedance,echoloss,VSWR,efficiency,gain,radiation fieldtype,sensitivity,power,frequencybiasactivedataTRPTIS 4 Proofplantappearanceandantenna 5 Matchingparameters number model specificatio ns manufact urer P/ N common difference 1 On-board antenna 2NC 3 inductance 1.5NH/0201 Villagefield ±0.1NH 4 inductance 1.2NH/0201 Villagefield ±0.1NH 6 NetworkdivisiondebuggingantennaSparameters Debuggingwaveform 7 Microwavedarkenedchamberteststheantenna efficiencyfieldtype 1.Testtheantennaefficiency inthemicrowavedarkchamber Feature assessment Pleasecheck accordingtothe measurement 10%Low  20%Medium  30% High  8 Microwavedarkchambertestsantennaefficiency 9 2D diagram of the microwave dark chamber 10 3D diagramof themicrowavedarkchamber 11 Sum up Specification FrequencyRange 2400 - 2500MHz Type of Antenna Directivity PCB Printed Antenna Directivity 0mnidirection PolarizationVertical Gain 3.3dBi Attachment TypeInternalmounted Manufacture Shenzhen YingfengAntenna Technolog yCo.,Ltd. Address Room 501, No.185, Pingshan Village, No.2, Lishan Road, Pingshan Community, Taoyuan Street, Nanshan District, Shenzhen, China

No.：BCTC/RF-EMC-007 Page: 1 of 80 Edition：A.5 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2304209187E Applicant: Shenzhen Skyringe Electronic Technology Co., Ltd. Product Name: Bluetooth Headphone Model/Type reference: BKM400 Tested Date: 2023-04-18 to 2023-04-23 Issued Date: 2023-04-28 Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 2 of 80 Edition：A.5 FCC ID: 2AHTV-SKYRINGE The test report is effective only with both signature and specialized stamp.This result(s) shown in this report refer only to the sample(s) tested. Without written approval of Shenzhen BCTC Testing Co., Ltd, this report can’t be reproduced except in full.The tested sample(s) and the sample information are provided by the client. Product Name: Bluetooth Headphone Trademark: N/A Model/Type Reference: BKM400 T711, T720, T710, T701, BKM200, BKM300, BKM500, BKM600, BKM700, T711TV Prepared For: Shenzhen Skyringe Electronic Technology Co., Ltd. Address: No.7 Tengfeng Avenue, D Building, Pioneer Park, 3rd Industrial Zone, Fenghuang Village, Fuyong Town, Baoan District, shenzhen, Guangdong, China Manufacturer: Shenzhen Skyringe Electronic Technology Co., Ltd. Address: No.7 Tengfeng Avenue, D Building, Pioneer Park, 3rd Industrial Zone, Fenghuang Village, Fuyong Town, Baoan District, shenzhen, Guangdong, China Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Zhancheng, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2023-04-17 Sample tested Date: 2023-04-18 to 2023-04-23 Issue Date: 2023-04-28 Report No.: BCTC2304209187E Test Standards: FCC Part15.247 ANSI C63.10-2013 Test Results: PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Eric Yang/Project Handler Zero Zhou/Reviewer Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 3 of 80 Edition：A.5 Table Of Content Test Report Declaration Page 1. Version .................................................................................................................. 5 2. Test Summary ....................................................................................................... 6 3. Measurement Uncertainty ..................................................................................... 7 4. Product Information And Test Setup ..................................................................... 8 4.1 Product Information ............................................................................................... 8 4.2 Test Setup Configuration ...................................................................................... 8 4.3 Support Equipment ............................................................................................... 9 4.4 Channel List .......................................................................................................... 9 4.5 Test Mode ........................................................................................................... 10 4.6 Table Of Parameters Of Text Software Setting ................................................... 10 5. Test Facility And Test Instrument Used ............................................................... 11 5.1 Test Facility ......................................................................................................... 11 5.2 Test Instrument Used .......................................................................................... 11 6. Conducted Emissions .......................................................................................... 13 6.1 Block Diagram Of Test Setup .............................................................................. 13 6.2 Limit .................................................................................................................... 13 6.3 Test procedure .................................................................................................... 13 6.4 EUT operating Conditions ................................................................................... 13 6.5 Test Result .......................................................................................................... 14 7. Radiated emissions ............................................................................................. 16 7.1 Block Diagram Of Test Setup .............................................................................. 16 7.2 Limit .................................................................................................................... 17 7.3 Test procedure .................................................................................................... 18 7.4 EUT operating Conditions ................................................................................... 19 7.5 Test Result .......................................................................................................... 20 8. Radiated Band Emission Measurement And Restricted Bands Of Operation ..... 24 8.1 Block Diagram Of Test Setup .............................................................................. 24 8.2 Limit .................................................................................................................... 24 8.3 Test procedure .................................................................................................... 25 8.4 EUT operating Conditions ................................................................................... 25 8.5 Test Result .......................................................................................................... 26 9. Spurious RF Conducted Emissions ..................................................................... 27 9.1 Block Diagram Of Test Setup .............................................................................. 27 9.2 Limit .................................................................................................................... 27 9.3 Test …

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Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 66 of 80 Edition：A.5 CFS NVNT 3-DH1 2480MHz Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 67 of 80 Edition：A.5 13. Number Of Hopping Frequency 13.1 Block Diagram Of Test Setup 13.2 Limit Frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels. 13.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set the spectrum analyzer: RBW = 100kHz. VBW = 300kHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. It may prove necessary to break the span up to sections. in order to clearly show all of the hopping frequencies. The limit is specified in one of the subparagraphs of this Section. 4. Set the spectrum analyzer: Start Frequency = 2.4GHz, Stop Frequency = 2.4835GHz. Sweep=auto; 13.4 Test Result Condition Mode Hopping Number Limit Verdict NVNT 1-DH1 79 15 Pass NVNT 2-DH1 79 15 Pass NVNT 3-DH1 79 15 Pass Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 68 of 80 Edition：A.5 Test Graphs Hopping No. NVNT 1-DH1 2441MHz Hopping No. NVNT 2-DH1 2441MHz Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 69 of 80 Edition：A.5 Hopping No. NVNT 3-DH1 2441MHz Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 70 of 80 Edition：A.5 14. Dwell Time 14.1 Block Diagram Of Test Setup 14.2 Limit Frequency hopping systems in the 2400-2483.5 MHz band shall use at least 15 channels. The average time of occupancy on any channel shall not be greater than 0.4 seconds within a period of 0.4 seconds multiplied by the number of hopping channels employed. Frequency hopping systems may avoid or suppress transmissions on a particular hopping frequency provided that a minimum of 15 channels are used. 14.3 Test procedure 1. Remove the antenna from the EUT and then connect a low RF cable from the antenna port to the spectrum. 2. Set spectrum analyzer span = 0. Centred on a hopping channel; 3. Set RBW = 1MHz and VBW = 3MHz.Sweep = as necessary to capture the entire dwell time per hopping channel. Set the EUT for DH5, DH3 and DH1 packet transmitting. 4. Use the marker-delta function to determine the dwell time. If this value varies with different modes of operation (e.g.. data rate. modulation format. etc.). repeat this test for each variation. The limit is specified in one of the subparagraphs of this Section. Submit this plot(s). 14.4 Test Result DH5 Packet permit maximum 1600 / 79 / 6 hops per second in each channel (5 time slots RX, 1 time slot TX). DH3 Packet permit maximum 1600 / 79 / 4 hops per second in each channel (3 time slots RX, 1 time slot TX). DH1 Packet permit maximum 1600 / 79 /2 hops per second in each channel (1 time slot RX, 1 time slot TX). So, the Dwell Time can be calculated as follows: DH5:1600/79/6*0.4*79*(MkrDelta)/1000 DH3:1600/79/4*0.4*79*(MkrDelta)/1000 DH1:1600/79/2*0.4*79*(MkrDelta)/1000 Remark: Mkr Delta is once pulse time. Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 71 of 80 Edition：A.5 Modulation Channel Data Packet pulse time(ms) Dwell Time(s) Limits(s) GFSK Middle 1DH1 0.403 0.129 0.4 1DH3 1.658 0.265 0.4 1DH5 2.906 0.310 0.4 π/ 4 DQPSK Middle 2DH1 0.406 0.130 0.4 2DH3 1.619 0.259 0.4 2DH5 2.865 0.306 0.4 8DPSK Middle 3DH1 0.415 0.133 0.4 3DH3 1.618 0.259 0.4 3DH5 2.909 0.310 0.4 Test Graphs Dwell NVNT 1-DH1 2441MHz One Burst Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 72 of 80 Edition：A.5 Dwell NVNT 1-DH3 2441MHz One Burst Dwell NVNT 1-DH5 2441MHz One Burst Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 73 of 80 Edition：A.5 Dwell NVNT 2-DH1 2441MHz One Burst Dwell NVNT 2-DH3 2441MHz One Burst Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 74 of 80 Edition：A.5 Dwell NVNT 2-DH5 2441MHz One Burst Dwell NVNT 3-DH1 2441MHz One Burst Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 75 of 80 Edition：A.5 Dwell NVNT 3-DH3 2441MHz One Burst Dwell NVNT 3-DH5 2441MHz One Burst Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 76 of 80 Edition：A.5 15. Antenna Requirement 15.1 Limit 15.203 requirement: For intentional device, according to 15.203: an intentional radiator shall be designed to ensure that no antenna other than that furnished by the responsible party shall be used with the device. 15.2 Test Result The EUT antenna is PCB antenna, fulfill the requirement of this section. Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 77 of 80 Edition：A.5 16. EUT Photographs NOTE: Appendix-Photographs Of EUT Constructional Details Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 78 of 80 Edition：A.5 17. EUT Test Setup Photographs Conducted emissions Radiated Measurement Photos Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 79 of 80 Edition：A.5 Report No.:BCTC2304209187E No.：BCTC/RF-EMC-007 Page: 80 of 80 Edition：A.5 STATEMENT 1. The equipment lists are traceable to the national reference standards. 2. The test report can not be partially copied unless prior written approval is issued from our lab. 3. The test report is invalid without the "special seal for inspection and testing". 4. The test report is invalid without the signature of the approver. 5. The test process and test result is only related to the Unit Under Test. 6. Sample information is provided by the client and the laboratory is not responsible for its authenticity. 7. The test report without CMA mark is only used for scientific research, teaching, enterprise product development and internal quality control purposes. 8. The quality system of our laboratory is in accordance with ISO/IEC17025. 9. If there is any objection to this test report, the client should inform issuing laboratory within 15 days from the date of receiving test report. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Zhancheng, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China TEL：400-788-9558 P. C.: 518103 FAX：0755-33229357 Website：http://www.chnbctc.com E-Mail：[email protected]…

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Conducted emissions Radiated Measurement Photos