2AKR3-USWORDWireless bluetooth earphone

Shenzhen XinZhengYu technology Co., ltd 2021.04.02 Eurofins Electrical and Electronic Testing NA, Inc. 914 W. Patapsco Avenue Baltimore, MD 21230 USA RE: CONFIDENTIALITY REQUEST FOR EUT NAME: Wireless bluetooth earphone Trademark: N/A MODEL : U-sword, U6, U7, U-king, U-king1, U-vid, U-vid1, F-aid, UFO4, Sp1, OW31 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 : JunHua Wu/General manager Contact information / address: 5th floor, Building 4, HaiTianLanYu Industrial Park, ShiLong Community, ShiYan Town, Bao'an District, Shenzhen China

Shenzhen XinZhengYu technology Co., ltd 2021.04.02 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 : JunHua Wu/General manager Contact information / address: 5th floor, Building 4, HaiTianLanYu Industrial Park, ShiLong Community, ShiYan Town, Bao'an District, Shenzhen China

Shenzhen XinZhengYu technology Co., ltd Model Difference 2021-04-02 EUT NAME: Wireless bluetooth earphone FCC ID: 2AKR3-USWORD MODEL : U-sword, U6, U7, U-king, U-king1, U-vid, U-vid1, F-aid, UFO4, Sp1, OW31 All the model are the same circuit and RF module, only for model name and color. Regards Sincerely Client’s signature Client’s name / title : JunHua Wu/General manager Contact information / address: 5th floor, Building 4, HaiTianLanYu Industrial Park, ShiLong Community, ShiYan Town, Bao'an District, Shenzhen China

External Photos

Size:15*6mm Wireless bluetooth earphone FCC ID: 2AKR3-USWORD Label location Label location

Internal Photos Antenna Antenna

RF EXPOSURE EVALUATION METHOD FCC ID: 2AKR3-USWORD SAR Test Exclusion Thresholds for 100 MHz – 6 GHz and ≤ 50 mm Approximate SAR Test Exclusion Power Thresholds at Selected Frequencies and Test Separation Distances are illustrated in the following Table. The 1-g 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 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 is applied to determine SAR test exclusion. BT-EDR Modulation Test Channel Output Power (dBm) Limit (dBm) GFSK Low -0.472 21 GFSK Middle 0.167 21 GFSK High 0.890 21 Pi/4 DQPSK Low -0.486 21 Pi/4 DQPSK Middle 0.122 21 Pi/4 DQPSK High 0.857 21 8DPSK Low -0.287 21 8DPSK Middle 0.378 21 8DPSK High 1.128 21 max possible output power (PK,conducted)：1±1dBm 3.15dBi logarithmic terms convert to numeric result is nearly 2.065 2dBm=1.59mW 2402MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=1.59/5*√2.402=0.49≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. 2441MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]= 1.59/5*√2.441=0.50≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. 2480MHz [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance,mm)] · [√f(GHz)]=1.59/5*√2.48=0.50≤3.0 Threshold at which no SAR required is 10mw and ≤ 3.0 for 1-g SAR, Separation distance is 5mm. Conclusion: No SAR is required.

No.：BCTC/RF-EMC-005 Page 1 of 71 Edition：A.3 TEST REPORT Shenzhen BCTC Testing Co., Ltd. Report No.: BCTC2103575922E Applicant: Shenzhen XinZhengYu technology Co., ltd Product Name: Wireless bluetooth earphone Model/Type Ref.: U-sword Tested Date: 2021-03-30 to 2021-04-01 Issued Date: 2021-04-02 Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 2 of 71 Edition：A.3 FCC ID: 2AKR3-USWORD 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: Wireless bluetooth earphone Trademark: N/A Model/Type Ref.: U-sword U6, U7, U-king, U-king1, U-vid, U-vid1, F-aid, UFO4, Sp1, OW31 Prepared For: Shenzhen XinZhengYu technology Co., ltd Address: 5th floor, Building 4, HaiTianLanYu Industrial Park, ShiLong Community, ShiYan Town, Bao'an District, Shenzhen China Manufacturer: Shenzhen XinZhengYu technology Co., ltd Address: 5th floor, Building 4, HaiTianLanYu Industrial Park, ShiLong Community, ShiYan Town, Bao'an District, Shenzhen China Prepared By: Shenzhen BCTC Testing Co., Ltd. Address: 1-2/F., Building B, Pengzhou Industrial Park, No.158, Fuyuan 1st Road, Tangwei, Fuhai Subdistrict, Bao'an District, Shenzhen, Guangdong, China Sample Received Date: 2021-03-30 Sample tested Date: 2021-03-30 to 2021-04-01 Issue Date: 2021-04-02 Report No.: BCTC2103575922E Test Standards FCC Part15.247 ANSI C63.10-2013 Test Results PASS Remark: This is Bluetooth Classic radio test report. Tested by: Approved by: Lei Chen/Project Handler Zero Zhou/Reviewer Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 3 of 71 Edition：A.3 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 ................................................ 9 4.3 Support Equipment ..................................................... 9 4.4 Channel List .......................................................... 10 4.5 Test Mode ............................................................ 10 4.6 table of parameters of text software setting ................................ 11 5. TEST FACILITY AND TEST INSTRUMENT USED ........................ 12 5.1 Test Facility ........................................................... 12 5.2 Test Instrument Used .................................................. 12 6. CONDUCTED EMISSIONS ............................................ 14 6.1 Block Diagram Of Test Setup ............................................ 14 6.2 Limit ................................................................. 14 6.3 Test procedure ........................................................ 14 6.4 EUT operating Conditions ............................................... 15 6.5 Test Result ........................................................... 16 7. RADIATED EMISSIONS .............................................. 18 7.1 Block Diagram Of Test Setup ............................................ 18 7.2 Limit ................................................................. 19 7.3 Test procedure ........................................................ 20 7.4 EUT operating Conditions ............................................... 21 7.5 Test Result ........................................................... 22 8. RADIATED BAND EMISSION MEASUREMENT AND RESTRICTED BANDS OF OPERATION .................................................. 26 8.1 Block Diagram Of Test Setup ............................................ 26 8.2 Limit ................................................................. 26 8.3 Test procedure ........................................................ 27 8.4 EUT operating Conditions ............................................... 27 8.5 Test Result ........................................................... 28 9. CONDUCTED EMISSION ............................................. 29 9.1 Block Diagram Of Test Setup ............................................ 29 9.2 Limit ................................................................. 29 9.3 Test procedure ........................................................ 29 9.4 Test Result ........................................................... 30 10. 20 DB BANDWIDTH .................................................. 39 10.1 Block Diagram Of Test Setup .......................................... 39 Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 4 of 71 Edition：A.3 10.2 Limit ................................................................ 39 10.3 Test procedure ....................................................... 39 10.4 Test Result .......................................................... 40 11. MAXIMUM PEAK OUTPUT POWER .................................... 45 11.1 Block Diagram Of Test Setup .......................................... 45 11.2 Limit ................................................................ 45 11.3 Test procedure ....................................................... 45 11.4 Test Result .......................................................... 46 12. HOPPING CHANNEL SEPARATION ................................... 51 12.1 Block Diagram Of Test Setup .......................................... 51 12.2 Limit ................................................................ 51 12.3 Test procedure ....................................................... 51 12.4 Test Result .......................................................... 52 13. NUMBER OF HOPPING FREQUENCY ..................................…

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Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 47 of 71 Edition：A.3 GFSK Middle Channel GFSK High Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 48 of 71 Edition：A.3 Pi/4 DQPSK Low Channel Pi/4 DQPSK Middle Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 49 of 71 Edition：A.3 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 50 of 71 Edition：A.3 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 51 of 71 Edition：A.3 12. HOPPING CHANNEL SEPARATION 12.1 Block Diagram Of Test Setup 12.2 Limit Frequency hopping systems shall have hopping channel carrier frequencies separated by a minimum of 25 kHz or the 20 dB bandwidth of the hopping channel, whichever is greater. Alternatively, frequency hopping systems operating in the 2400-2483.5 MHz band may have hopping channel carrier frequencies that are separated by 25 kHz or two-thirds of the 20 dB bandwidth of the hopping channel, whichever is greater, provided the systems operate with an output power no greater than 0.125W. 12.3 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 = 30kHz. VBW = 100kHz , Span = 2.0MHz. Sweep = auto; Detector Function = Peak. Trace = Max hold. 3. Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. The limit is specified in one of the subparagraphs of this Section Submit this plot. Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 52 of 71 Edition：A.3 12.4 Test Result Modulation Test Channel Separation (MHz) Limit(MHz) Result GFSK Low 1.004 0.583 PASS GFSK Middle 1.000 0.574 PASS GFSK High 1.000 0.583 PASS Pi/4 DQPSK Low 1.000 0.811 PASS Pi/4 DQPSK Middle 1.004 0.809 PASS Pi/4 DQPSK High 1.000 0.813 PASS 8DPSK Low 1.002 0.801 PASS 8DPSK Middle 1.004 0.807 PASS 8DPSK High 1.000 0.807 PASS Test plots GFSK Low Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 53 of 71 Edition：A.3 GFSK Middle Channel GFSK High Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 54 of 71 Edition：A.3 Pi/4 DQPSK Low Channel Pi/4 DQPSK Middle Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 55 of 71 Edition：A.3 Pi/4 DQPSK High Channel 8DPSK Low Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 56 of 71 Edition：A.3 8DPSK Middle Channel 8DPSK High Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 57 of 71 Edition：A.3 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; Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 58 of 71 Edition：A.3 13.4 Test Result Test Plots: 79 Channels in total GFSK Pi/4 DQPSK Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 59 of 71 Edition：A.3 8DPSK Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 60 of 71 Edition：A.3 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). Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 61 of 71 Edition：A.3 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. Modulation Channel Data Packet pulse time(ms) Dwell Time(s) Limits(s) GFSK Middle DH1 0.404 0.129 0.4 DH3 1.662 0.266 0.4 DH5 2.920 0.311 0.4 Pi/4DQPSK Middle 2DH1 0.414 0.132 0.4 2DH3 1.674 0.268 0.4 2DH5 2.940 0.314 0.4 8DPSK Middle 3DH1 0.414 0.132 0.4 3DH3 1.668 0.267 0.4 3DH5 2.940 0.314 0.4 Test Plots GFSK DH1 Middle Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 62 of 71 Edition：A.3 GFSK DH3 Middle Channel GFSK DH5 High Middle Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 63 of 71 Edition：A.3 Pi/4DQPSK DH1 Middle Channel Pi/4DQPSK DH3 Middle Channel Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 64 of 71 Edition：A.3 Pi/4DQPSK DH5 Middle Channel 8DPSK DH1 Middle Channel Repo…

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Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 69 of 71 Edition：A.3 17. EUT TEST SETUP PHOTOGRAPHS Conducted emissions Radiated Measurement Photos Report No.: BCTC2103575922E No.：BCTC/RF-EMC-005 Page 70 of 71 Edition：A.3