2BDN3-SK27smart watch

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. Changes or modifications to this unit 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. This device and its antenna(s) must not be co-located or operation in conjunction with any other antenna or transmitter. Radiation Exposure Statement The device has been evaluated to meet general RF exposure requirement in portable exposure condition without restriction.

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 4 EXTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 4 Fig.3 Fig.4 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 4 Fig.5 Fig.6 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 4 of 4 Fig.7

Label Location: FCC ID: 2BDN3-SK27

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 3 INTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 3 Fig.3 Fig.4 BR/EDR Antenna BLE Antenna Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 3 Fig.5 Fig.6

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 4 RADIO FREQUENCY EXPOSURE Limit According to section B.4 of 447498 D04 Interim General RF Exposure Guidance v01 SAR-based thresholds are derived based on frequency, power, and separation distance of the RF source. The formula defines the thresholds in general for either available maximum time-averaged power or maximum time-averaged ERP, whichever is greater. If the ERP of a device is not easily determined, such as for a portable device with a small form factor, the applicant may use the available maximum time-averaged power exclusively if the device antenna or radiating structure does not exceed an electrical length of λ/4. As for devices with antennas of length greater than λ/4 where the gain is not well defined, but always less than that of a half-wave dipole (length λ/2), the available maximum time-averaged power generated by the device may be used in place of the maximum time-averaged ERP, where that value is not known. The separation distance is the smallest distance from any part of the antenna or radiating structure for all persons, during operation at the applicable ERP. In the case of mobile or portable devices, the separation distance is from the outer housing of the device where it is closest to the antenna. The SAR-based exemption formula of § 1.1307(b)(3)(i)(B), repeated here as Formula (B.2), applies for single fixed, mobile, and portable RF sources with available maximum time-averaged power or effective radiated power (ERP), whichever is greater, of less than or equal to the threshold Pth (mW). This method shall only be used at separation distances from 0.5 cm to 40 cm and at frequencies from 0.3 GHz to 6 GHz (inclusive). Pth is given by Formula (B.2). Where and f is in GHz, d is the separation distance (cm), and ERP 20cm is per Formula (B.1). Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 4 The example values shown in Table B.2 are for illustration only. Frequency (MHz) Distance (mm) 5 10 15 20 25 30 35 40 45 50 300 39 65 88 110 129 148 166 184 201 217 450 22 44 67 89 112 135 158 180 203 226 835 9 25 44 66 90 116 145 175 207 240 1900 3 12 26 44 66 92 122 157 195 236 2450 3 10 22 38 59 83 111 143 179 219 3600 2 8 18 32 49 71 96 125 158 195 5800 1 6 14 25 40 58 80 106 136 169 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 4 Conducted Power Results BR/EDR Test Mode Channel Frequency (MHz) Measured Peak Output Power (dBm) GFSK 00 2402 -4.29 39 2441 -3.35 78 2480 -3.28 π/4-DQPSK 00 2402 -3.44 39 2441 -2.72 78 2480 -2.59 BLE Test Mode Channel Frequency (MHz) Measured Peak Output Power (dBm) GFSK(1Mbps) 00 2402 -1.55 19 2440 -1.49 39 2480 -1.74 GFSK(2Mbps) 00 2402 -1.56 19 2440 -1.45 39 2480 -1.73 Manufacturing tolerance BR/EDR GFSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -4.5 -3.5 -3.5 Tolerance ±(dB) 1.0 1.0 1.0 π/4-DQPSK (Peak) Channel Channel 0 Channel 39 Channel 78 Target (dBm) -3.5 -3.0 -3.0 Tolerance ±(dB) 1.0 1.0 1.0 BLE GFSK (1Mbps Peak) Channel Channel 0 Channel 19 Channel 39 Target (dBm) -2.0 -1.5 -2.0 Tolerance ±(dB) 1.0 1.0 1.0 GFSK (2Mbps Peak) Channel Channel 0 Channel 19 Channel 39 Target (dBm) -2.0 -1.5 -2.0 Tolerance ±(dB) 1.0 1.0 1.0 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 4 of 4 Results BR/EDR Test Mode Channel Frequency (MHz) Max. Tune Up Power (dBm, Peak) Max. Eirp including Tune Up (dBm, Peak) Max. Eirp including Tune Up (mW, Peak) Exemption Limit (mW) GFSK 2402 -3.5 -2.0 0.63 3 2441 -2.5 -1.0 0.79 3 2480 -2.5 -1.0 0.79 3 π/4-DQPSK 2402 -2.5 -1.0 0.79 3 2441 -2.0 -0.5 0.89 3 2480 -2.0 -0.5 0.89 3 BLE Test Mode Channel Frequency (MHz) Max. Tune Up Power (dBm, Peak) Max. Eirp including Tune Up (dBm, Peak) Max. Eirp including Tune Up (mW, Peak) Exemption Limit (mW) GFSK(1Mbps) 2402 -1.0 0.5 1.12 3 2440 -0.5 1.0 1.26 3 2480 -1.0 0.5 1.12 3 GFSK(2Mbps) 2402 -1.0 0.5 1.12 3 2440 -0.5 1.0 1.26 3 2480 -1.0 0.5 1.12 3 The antenna gain of the EUT for BT is 1.5dBi (Max). the Maximum Eirp is used for Routine Evaluation Exemption according to B.4 of 447498 D04 Interim General RF Exposure Guidance v01. So, the SAR evaluation is not required.

Product specification Model: N/A Manufacturer: Shenzhen Yunchuang Century Technology Co., Ltd. Quick Reference Date Antenna module on the system board Frequenc Range 2400 ~ 2500MHz Ant. Port Input Pwr. (dBm) 0 (Typ. BT class 2 output power) Directivity (dBi) 1 (all direction antenna) Efficiency (dB) 6 0.2 % Gain (dBi) 1.5dBi (Peak Gain) Input Impendence(ohm) 50 Polarization Type Vertical & Horizontal V.S.W.R < 1.4 All the technical data and information contained herein are subject to change without prior notice Antenna Layout & module on the system board Antenna Gain Gain Table Unit in dBi XY-plane XZ-plane YZ-plane Efficiency Peak Avg. Peak Avg. Peak Avg. Module Board 1.5 -1.5 -0.9 -6.6 -2.5 -6.1 60.2 % Retum Loss The Environment of Antenna Radiation Pattem 3D radiation pattern diagram XY-plane XZ-plane YZ-plane

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 1 of 34 Appendix Test Data for BT(BDR/EDR) (Conducted Measurement) Product Name: smart watch Trade Mark: N/A Test Model: SK27 FCC ID: 2BDN3-SK27 Environmental Conditions Temperature: 25.5C Relative Humidity: 55% ATM Pressure: 100.0 kPa Test Engineer: Anna Hu Supervised by: Hugo Chen NOTE N/A Appendix A: 20dB Emission Bandwidth Test Result TestMode Antenna Channel 20db EBW[MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.936 2401.562 2402.498 --- --- 2441 0.894 2440.562 2441.456 --- --- 2480 0.936 2479.562 2480.498 --- --- 2DH5 Ant1 2402 1.338 2401.352 2402.690 --- --- 2441 1.257 2440.388 2441.645 --- --- 2480 1.359 2479.346 2480.705 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 2 of 34 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 2DH5_Ant1_2402 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 3 of 34 2DH5_Ant1_2441 2DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 4 of 34 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Channel OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict DH5 Ant1 2402 0.84947 2401.5904 2402.4398 --- --- 2441 0.85931 2440.5866 2441.4459 --- --- 2480 0.85534 2479.5877 2480.4431 --- --- 2DH5 Ant1 2402 1.1809 2401.4277 2402.6086 --- --- 2441 1.1774 2440.4294 2441.6068 --- --- 2480 1.1880 2479.4253 2480.6133 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 5 of 34 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 2DH5_Ant1_2402 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 6 of 34 2DH5_Ant1_2441 2DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 7 of 34 Appendix C: Maximum Peak conducted output power Test Result TestMode Antenna Channel Result[dBm] Limit[dBm] Verdict DH5 Ant1 2402 -4.29 ≤20.97 PASS 2441 -3.35 ≤20.97 PASS 2480 -3.28 ≤20.97 PASS 2DH5 Ant1 2402 -3.44 ≤20.97 PASS 2441 -2.72 ≤20.97 PASS 2480 -2.59 ≤20.97 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 8 of 34 Test Graphs DH5_Ant1_2402 DH5_Ant1_2441 DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 9 of 34 2DH5_Ant1_2402 2DH5_Ant1_2441 2DH5_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 10 of 34 Appendix D: Carrier frequency separation Test Result TestMode Antenna Channel Result[MHz] Limit[MHz] Verdict DH5 Ant1 Hop 1.164 ≥0.936 PASS 2DH5 Ant1 Hop 0.99 ≥0.906 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 11 of 34 Test Graphs DH5_Ant1_Hop 2DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 12 of 34 Appendix E: Time of occupancy Test Result TestMode Antenna Channel BurstWidth [ms] TotalHops [Num] Result[s] Limit[s] Verdict DH5 Ant1 Hop 2.878 130 0.374 ≤0.4 PASS 2DH5 Ant1 Hop 2.884 130 0.375 ≤0.4 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 13 of 34 Test Graphs DH5_Ant1_Hop 2DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 14 of 34 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 15 of 34 Appendix F: Number of hopping channels Test Result TestMode Antenna Channel Result[Num] Limit[Num] Verdict DH5 Ant1 Hop 79 ≥15 PASS 2DH5 Ant1 Hop 79 ≥15 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 16 of 34 Test Graphs DH5_Ant1_Hop 2DH5_Ant1_Hop Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 17 of 34 Appendix G: Band edge measurements Test Result TestMode Antenna ChName Channel RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 Low 2402 -4.96 -46.25 ≤-24.96 PASS High 2480 -3.91 -47.7 ≤-23.91 PASS Low Hop_2402 -5.00 -50.36 ≤-25 PASS High Hop_2480 -4.34 -49.31 ≤-24.34 PASS 2DH5 Ant1 Low 2402 -4.91 -45.92 ≤-24.91 PASS High 2480 -3.83 -47.93 ≤-23.83 PASS Low Hop_2402 -8.75 -50.53 ≤-28.75 PASS High Hop_2480 -7.21 -49.75 ≤-27.21 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 18 of 34 Test Graphs DH5_Ant1_Low_2402 DH5_Ant1_High_2480 DH5_Ant1_Low_Hop_2402 DH5_Ant1_High_Hop_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 19 of 34 2DH5_Ant1_Low_2402 2DH5_Ant1_High_2480 2DH5_Ant1_Low_Hop_2402 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 20 of 34 2DH5_Ant1_High_Hop_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 21 of 34 Appendix H: Conducted Spurious Emission Test Result TestMode Antenna Channel FreqRange [MHz] RefLevel [dBm] Result [dBm] Limit [dBm] Verdict DH5 Ant1 2402 Reference -5.41 -5.41 --- PASS 30~1000 -5.41 -62.52 ≤-25.41 PASS 1000~26500 -5.41 -49.06 ≤-25.41 PASS 2441 Reference -4.77 -4.77 --- PASS 30~1000 -4.77 -63.27 ≤-24.77 PASS 1000~26500 -4.77 -50.02 ≤-24.77 PASS 2480 Reference -4.37 -4.37 --- PASS 30~1000 -4.37 -62.66 ≤-24.37 PASS 1000~26500 -4.37 -46.76 ≤-24.37 PASS 2DH5 Ant1 2402 Reference -6.46 -6.46 --- PASS 30~1000 -6.46 -62.4 ≤-26.46 PASS 1000~26500 -6.46 -49.14 ≤-26.46 PASS 2441 Reference -4.86 -4.86 --- PASS 30~1000 -4.86 -62.29 ≤-24.86 PASS 1000~26500 -4.86 -48.99 ≤-24.86 PASS 2480 Reference -8.01 -8.01 --- PASS 30~1000 -8.01 -62.82 ≤-28.01 PASS 1000~26500 -8.01 -47.6 ≤-28.01 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 22 of 34 Test Graphs DH5_Ant1_2402_0~Reference DH5_Ant1_2402_30~1000 DH5_Ant1_2402_1000~26500 DH5_Ant1_2441_0~Reference Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 Report No.: TZ231105074-E2 Page 23 of 34 DH5_Ant1_2441_30~1000 DH5_Ant1_2441_1000~26500 DH5_Ant1_2480_…

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Report No.: TZ231105074-E2 Page 1 of 38 FCC TEST REPORT Test report On Behalf of Shenzhen Huaying Communication Co. LTD For smart watch Model No: SK27, SK4, SK4Max, SK22, SK23, SK24, SK25, SK26, SK28, SK29, SK30, SK31, SK32, SK33, SK35, SK36, SK37, SK38, SK48, GT5 Buds, GT6 Buds, H4Max, H5, H6 FCC ID: 2BDN3-SK27 Prepared for : Shenzhen Huaying Communication Co. LTD 4 / F, Building 5, Saitu Digital Industrial Factory, No. 137, Bulan Road, Jihua Street, Longgang District, Shenzhen, China Prepared By : Shenzhen Tongzhou Testing Co.,Ltd 1th Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China Date of Test: 2023/11/17 – 2023/11/27 Date of Report: 2023/11/28 Report Number: TZ231105074-E2 The test report apply only to the specific sample(s) tested under stated test conditions It is not permitted to copy extracts of these test result without the written permission of the test laboratory. Report No.: TZ231105074-E2 Page 2 of 38 TEST RESULT CERTIFICATION Applicant’s name ................. : Shenzhen Huaying Communication Co. LTD Address .................................. : 4 / F, Building 5, Saitu Digital Industrial Factory, No. 137, Bulan Road, Jihua Street, Longgang District, Shenzhen, China Manufacture's Name ............ : Shenzhen Huaying Communication Co. LTD Address .................................. : 4 / F, Building 5, Saitu Digital Industrial Factory, No. 137, Bulan Road, Jihua Street, Longgang District, Shenzhen, China. Product description Trade Mark ............................. : N/A Product name ........................... : smart watch Model No ................................ : SK27, SK4, SK4Max, SK22, SK23, SK24, SK25, SK26, SK28, SK29, SK30, SK31, SK32, SK33, SK35, SK36, SK37, SK38, SK48, GT5 Buds, GT6 Buds, H4Max, H5, H6 Standards ............................. : FCC Rules and Regulations Part 15 Subpart C Section 15.247 ANSI C63.10: 2013 This publication may be reproduced in whole or in part for non-commercial purposes as long as the Shenzhen Tongzhou Testing Co.,Ltd is acknowledged as copyright owner and source of the material. Shenzhen Tongzhou Testing Co.,Ltd takes no responsibility for and will not assume liability for damages resulting from the reader's interpretation of the reproduced material due to its placement and context. Date of Test ............................. ........... : Date (s) of performance of tests ........... : 2023/11/17-2023/11/27 Date of Issue ......................................... : 2023/11/28 Test Result ............................................ : PASS Testing Engineer : (Nancy Li) Technical Manager : (Hugo Chen) Authorized Signatory : (Andy Zhang) Report No.: TZ231105074-E2 Page 3 of 38 Revision History Revision Issue Date Revisions Revised By 00 2023/11/28 Initial Issue Andy Zhang Report No.: TZ231105074-E2 Page 4 of 38 TABLE OF CONTENTS Description Page 1. GENERAL INFORMATION ................................................................................................................ 5 1.1. Description of Device (EUT) ................................................................................................................... 5 1.2 Support equipment List ................................................................................................................................ 5 1.3 EUT configuration ......................................................................................................................................... 5 The following peripheral devices and interface cables were connected during the measurement: ....... 5 1.4 External I/O Cable ........................................................................................................................................ 5 1.5 Description of Test Facility .......................................................................................................................... 6 1.6 Statement of the Measurement Uncertainty ............................................................................................. 7 1.7 Measurement Uncertainty ........................................................................................................................... 7 1.8 Description of Test Modes .......................................................................................................................... 7 2. TEST METHODOLOGY ...................................................................................................................... 8 2.1 EUT Configuration ........................................................................................................................................ 8 2.2 EUT Exercise ................................................................................................................................................ 8 2.3 General Test Procedures ............................................................................................................................ 8 2.4. Test Sample ................................................................................................................................................. 8 3. SYSTEM TEST CONFIGURATION .................................................................................................. 9 3.1 Justification .................................................................................................................................................... 9 3.2 EUT Exercise Software ............................................................................................................................... 9 3.3 Special Accessories ..................................................................................................................................... 9 3.4 Block Diagram/Schematics ......................................................................................................................... 9 3.5 Equipment Modifications ......................................…

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Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 2 TEST SETUP PHOTOS OF THE EUT Radiated Emission Below 1GHz Radiated Emission Above 1GHz Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BDN3-SK27 This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 2 Conducted Emission