2BGKB-K4MAXWireless Keyboard

天线规格书 Antenna Specific 制造商(Manufacturer) ： Shenzhen Ouchao Technology Co., Ltd 地址(address) ： 303, Building 34, Longzhu Garden, Xixiang Street, Bao’an District, Shenzhen, China. 产品种类：PCB Antenna Product Type: PCB Antenna 产品技术指标(Technical parameter) Electronic Parameter 频率范围(Frequency Range) 2400~2500MHz 输入阻抗(input impedance) 50Ω 驻波比(VSWR) ≤2 增益(Gain) Max 0.0dBi Physical Parameter 工作温度(operation temperature) -30°C~+80°C 储存温度(store temperature) -30°C~+80°C 产品规格图(Antenna Specification chart) Test Result: Frequency Gain.dBi Frequency Efficiency 2400MHz -0.31 2400MHz 28% 2450MHz 0.0 2450MHz 31% 2500MHz -0.71 2500MHz 36% Direction: Smith Chart: VSWR:

FCC ID:2BGKB-K4MAX Page 1 of 2 Test Setup Photos of the EUT Conducted Emission Radiated Emission Below 1GHz FCC ID:2BGKB-K4MAX Page 2 of 2 Radiated Emission Above 1GHz

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. 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. Page 1 of 31 TEST REPORT Report Number : TZ0015250103FRF12 Product Name : Wireless Keyboard Model/Type reference : K4 Max FCC ID : 2BGKB-K4MAX Prepared for : Keychron Technology (Shenzhen) Co., Ltd. 201, Building 2, Wenkeng Industrial Zone, No. 24, Dafa Road, DafaPu Community, Bantian Jie Dao, Longgang District, Shenzhen, China Prepared By : Shenzhen Tongzhou Testing Co.,Ltd. 1st Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China Standards : FCC CFR Title 47 Part 15C, ANSI C63.10: 2013 Date of Test : 2025-01-13 ~ 2025-01-19 Date of Issue : 2025-01-20 Prepared by : Lena Wen (File administrators) Reviewed by : Max Zhang (Technique principal) Approved by : Andy Zhang (General Manager) Report No.: TZ0015250103FRF12 Page 2 of 31 ** Report Revise Record ** Report Version Revise Time Issued Date Valid Version Notes V1.0 / 2025-01-20 Valid Initial release Report No.: TZ0015250103FRF12 Page 3 of 31 TASRD OF CONTENTS 1. G E N E R A L I N F O R M A T I O N ....................................................... 4 1.1. Client Information ................................................................................................................... 4 1.2. Description of Device (EUT) ................................................................................................... 4 1.3. Wireless Function Tested in this Report .............................................................................. 4 1.4. EUT configuration ................................................................................................................... 5 1.5. Description of Test Facility .................................................................................................... 5 1.6. Statement of the Measurement Uncertainty ......................................................................... 6 1.7. Measurement Uncertainty ...................................................................................................... 6 1.8. Description of Test Modes ..................................................................................................... 6 1.9. Frequency of Channels .......................................................................................................... 6 2. T E S T M E T H O D O L O G Y ............................................................ 7 2.1. EUT Configuration .................................................................................................................. 7 2.2. EUT Exercise ........................................................................................................................... 7 2.3. Test Sample ............................................................................................................................. 7 3. S Y S T E M T E S T C O N F I G U R A T I O N .............................................. 8 3.1. Justification ............................................................................................................................. 8 3.2. EUT Exercise Software ........................................................................................................... 8 3.3. Special Accessories ............................................................................................................... 8 3.4. Block Diagram/Schematics .................................................................................................... 8 3.5. Equipment Modifications ....................................................................................................... 8 3.6. Test Setup ................................................................................................................................ 8 4. S U M M A R Y O F T E S T R E S U L T S ................................................. 9 5. T E S T R E S U L T .................................................................... 10 5.1. On Time and Duty Cycle ....................................................................................................... 10 5.2. Maximum Peak Conducted Output Power Measurement ................................................. 11 5.3. Power Spectral Density Measurement ................................................................................ 12 5.4. 6 dB Spectrum Bandwidth Measurement ........................................................................... 13 5.5. Radiated Emissions Measurement ...................................................................................... 14 5.6. Conducted Spurious Emissions and Band Edges Test .................................................... 22 5.7. AC Power line conducted emissions .................................................................................. 23 5.8. Band-edge measurements for radiated emissions ........................................................... 26 5.9. Antenna Requirements ......................................................................................................... 29 6. L I S T O F M E A S U R I N G E Q U I P M E N T S ....................................... 30 7. T E S T S E T U P P H O T O G R A P H S O F E U T ..................................... 31 8. E X T E R I O R P H O T O G R A P H S O F E U T ........................................ 31 9. I N T E R I O R P H O T O G R A P H S O F E U T ...................................…

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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. 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. Page 1 of 31 TEST REPORT Report Number : TZ0015250103FRF02 Product Name : Wireless Keyboard Model/Type reference : K4 Max FCC ID : 2BGKB-K4MAX Prepared for : Keychron Technology (Shenzhen) Co., Ltd. 201, Building 2, Wenkeng Industrial Zone, No. 24, Dafa Road, DafaPu Community, Bantian Jie Dao, Longgang District, Shenzhen, China Prepared By : Shenzhen Tongzhou Testing Co.,Ltd. 1st Floor, Building 1, Haomai High-tech Park, Huating Road 387, Dalang Street, Longhua, Shenzhen, China Standards : FCC CFR Title 47 Part 15C, ANSI C63.10: 2013 Date of Test : 2025-01-13 ~ 2025-01-19 Date of Issue : 2025-01-20 Prepared by : Lena Wen (File administrators) Reviewed by : Max Zhang (Technique principal) Approved by : Andy Zhang (General Manager) Report No.: TZ0015250103FRF02 Page 2 of 31 ** Report Revise Record ** Report Version Revise Time Issued Date Valid Version Notes V1.0 / 2025-01-20 Valid Initial release Report No.: TZ0015250103FRF02 Page 3 of 31 TABLE OF CONTENTS 1. G E N E R A L I N F O R M A T I O N ....................................................... 4 1.1. Client Information ................................................................................................................... 4 1.2. Description of Device (EUT) ................................................................................................... 4 1.3. Wireless Function Tested in this Report .............................................................................. 4 1.4. EUT configuration ................................................................................................................... 5 1.5. Description of Test Facility .................................................................................................... 5 1.6. Statement of the Measurement Uncertainty ......................................................................... 6 1.7. Measurement Uncertainty ...................................................................................................... 6 1.8. Description of Test Modes ..................................................................................................... 6 1.9. Frequency of Channels .......................................................................................................... 6 2. T E S T M E T H O D O L O G Y ............................................................ 7 2.1. EUT Configuration .................................................................................................................. 7 2.2. EUT Exercise ........................................................................................................................... 7 2.3. Test Sample ............................................................................................................................. 7 3. S Y S T E M T E S T C O N F I G U R A T I O N .............................................. 8 3.1. Justification ............................................................................................................................. 8 3.2. EUT Exercise Software ........................................................................................................... 8 3.3. Special Accessories ............................................................................................................... 8 3.4. Block Diagram/Schematics .................................................................................................... 8 3.5. Equipment Modifications ....................................................................................................... 8 3.6. Test Setup ................................................................................................................................ 8 4. S U M M A R Y O F T E S T R E S U L T S ................................................. 9 5. T E S T R E S U L T .................................................................... 10 5.1. On Time and Duty Cycle ....................................................................................................... 10 5.2. Maximum Peak Conducted Output Power Measurement ................................................. 11 5.3. Power Spectral Density Measurement ................................................................................ 12 5.4. 6 dB Spectrum Bandwidth Measurement ........................................................................... 13 5.5. Radiated Emissions Measurement ...................................................................................... 14 5.6. Conducted Spurious Emissions and Band Edges Test .................................................... 22 5.7. AC Power line conducted emissions .................................................................................. 23 5.8. Band-edge measurements for radiated emissions ........................................................... 26 5.9. Antenna Requirements ......................................................................................................... 29 6. L I S T O F M E A S U R I N G E Q U I P M E N T S ....................................... 30 7. T E S T S E T U P P H O T O G R A P H S O F E U T ..................................... 31 8. E X T E R I O R P H O T O G R A P H S O F E U T ........................................ 31 9. I N T E R I O R P H O T O G R A P H S O F E U T ...................................…

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Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 1 of 22 Appendix Test Data for SRD (Conducted Measurement) Product Name: Wireless Keyboard Trade Mark: Keychron Test Model: K4 Max FCC ID: 2BGKB-K4MAX Environmental Conditions Temperature: 23.5°C Relative Humidity: 58% ATM Pressure: 100.0 kPa Test Engineer: Allen Lai Supervised by: Hugo Chen NOTE N/A Appendix A: DTS Bandwidth Test Result Test Mode Antenna Frequency [MHz] DTS BW [MHz] FL [MHz] FH [MHz] Limit [MHz] Verdict SRD Ant1 2402 1.176 2401.416 2402.592 0.5 PASS SRD Ant1 2440 1.148 2439.440 2440.588 0.5 PASS SRD Ant1 2480 1.132 2479.436 2480.568 0.5 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 2 of 22 Test Graphs SRD-Ant1-2402-PASS SRD-Ant1-2440-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 3 of 22 SRD-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 4 of 22 Appendix B: Occupied Channel Bandwidth Test Result Test Mode Antenna Frequency [MHz] OCB [MHz] FL [MHz] FH [MHz] Limit [MHz] Verdict SRD Ant1 2402 1.8891 2401.0664 2402.9555 --- --- SRD Ant1 2440 1.9372 2439.0445 2440.9817 --- --- SRD Ant1 2480 1.9094 2479.0521 2480.9615 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 5 of 22 Test Graphs SRD-Ant1-2402 SRD-Ant1-2440 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 6 of 22 SRD-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 7 of 22 Appendix C: Maximum peak conducted output power Test Result Peak Test Mode Antenna Frequency [MHz] Conducted Peak Power [dBm] Conducted Limit [dBm] Verdict SRD Ant1 2402 -3.48 ≤30 PASS SRD Ant1 2440 -1.73 ≤30 PASS SRD Ant1 2480 -2.00 ≤30 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 8 of 22 Test Graphs Peak SRD-Ant1-2402-PASS SRD-Ant1-2440-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 9 of 22 SRD-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 10 of 22 Appendix D: Maximum peak power spectral density Test Result Test Mode Antenna Frequency [MHz] Result [dBm/3kHz] Limit [dBm/3kHz] Verdict SRD Ant1 2402 -22.10 ≤8.00 PASS SRD Ant1 2440 -20.33 ≤8.00 PASS SRD Ant1 2480 -20.58 ≤8.00 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 11 of 22 Test Graphs SRD-Ant1-2402-PASS SRD-Ant1-2440-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 12 of 22 SRD-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 13 of 22 Appendix E: Band edge measurements Test Result Test Mode Antenna Ch. Name Frequency [MHz] Ref. Level [dBm] Result [dBm] Limit [dBm] Verdict SRD Ant1 Low 2402 -6.14 -50 ≤-26.14 PASS SRD Ant1 High 2480 -5.35 -48.52 ≤-25.35 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 14 of 22 Test Graphs SRD-Ant1-2402-PASS SRD-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 15 of 22 Appendix F: Conducted Spurious Emission Test Result Test Mode Antenna Frequency [MHz] Freq. Range [MHz] Ref. Level [dBm] Result [dBm] Limit [dBm] Verdict SRD Ant1 2402 0~Reference -4.85 -4.85 --- PASS SRD Ant1 2402 30~1000 -4.85 -72.32 ≤-24.85 PASS SRD Ant1 2402 1000~26500 -4.85 -55.79 ≤-24.85 PASS SRD Ant1 2440 0~Reference -4.08 -4.08 --- PASS SRD Ant1 2440 30~1000 -4.08 -73.07 ≤-24.08 PASS SRD Ant1 2440 1000~26500 -4.08 -46.56 ≤-24.08 PASS SRD Ant1 2480 0~Reference -3.03 -3.03 --- PASS SRD Ant1 2480 30~1000 -3.03 -73.08 ≤-23.03 PASS SRD Ant1 2480 1000~26500 -3.03 -55.35 ≤-23.03 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 16 of 22 Test Graphs SRD-Ant1-2402-0~Reference-PASS SRD-Ant1-2402-30~1000-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 17 of 22 SRD-Ant1-2402-1000~26500-PASS SRD-Ant1-2440-0~Reference-PASS SRD-Ant1-2440-30~1000-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 18 of 22 SRD-Ant1-2440-1000~26500-PASS SRD-Ant1-2480-0~Reference-PASS SRD-Ant1-2480-30~1000-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 19 of 22 SRD-Ant1-2480-1000~26500-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 20 of 22 Appendix G: Duty Cycle Test Result Test Mode Antenna Frequency [MHz] ON Time [ms] Period [ms] Duty Cycle [%] Duty Cycle Factor [dB] SRD Ant1 2402 10.00 10.00 100.00 0.00 SRD Ant1 2440 10.00 10.00 100.00 0.00 SRD Ant1 2480 10.00 10.00 100.00 0.00 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 21 of 22 Test Graphs NTNV-SRD-Ant1-2402 NTNV-SRD-Ant1-2440 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF12 Page 22 of 22 NTNV-SRD-Ant1-2480

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 1 of 22 Appendix Test Data for BLE (Conducted Measurement) Product Name: Wireless Keyboard Trade Mark: Keychron Test Model: K4 Max FCC ID: 2BGKB-K4MAX Environmental Conditions Temperature: 23.5°C Relative Humidity: 58% ATM Pressure: 100.0 kPa Test Engineer: Allen Lai Supervised by: Hugo Chen NOTE N/A Appendix A: DTS Bandwidth Test Result Test Mode Antenna Frequency [MHz] DTS BW [MHz] FL [MHz] FH [MHz] Limit [MHz] Verdict BLE_1M Ant1 2402 0.716 2401.640 2402.356 0.5 PASS BLE_1M Ant1 2440 0.716 2439.640 2440.356 0.5 PASS BLE_1M Ant1 2480 0.632 2479.688 2480.320 0.5 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 2 of 22 Test Graphs BLE_1M-Ant1-2402-PASS BLE_1M-Ant1-2440-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 3 of 22 BLE_1M-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 4 of 22 Appendix B: Occupied Channel Bandwidth Test Result Test Mode Antenna Frequency [MHz] OCB [MHz] FL [MHz] FH [MHz] Limit [MHz] Verdict BLE_1M Ant1 2402 1.0316 2401.4878 2402.5194 --- --- BLE_1M Ant1 2440 1.0484 2439.4816 2440.5300 --- --- BLE_1M Ant1 2480 1.0422 2479.4823 2480.5245 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 5 of 22 Test Graphs BLE_1M-Ant1-2402 BLE_1M-Ant1-2440 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 6 of 22 BLE_1M-Ant1-2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 7 of 22 Appendix C: Maximum peak conducted output power Test Result Peak Test Mode Antenna Frequency [MHz] Conducted Peak Power [dBm] Conducted Limit [dBm] Verdict BLE_1M Ant1 2402 -2.13 ≤30 PASS BLE_1M Ant1 2440 -2.15 ≤30 PASS BLE_1M Ant1 2480 -2.77 ≤30 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 8 of 22 Test Graphs Peak BLE_1M-Ant1-2402-PASS BLE_1M-Ant1-2440-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 9 of 22 BLE_1M-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 10 of 22 Appendix D: Maximum peak power spectral density Test Result Test Mode Antenna Frequency [MHz] Result [dBm/3kHz] Limit [dBm/3kHz] Verdict BLE_1M Ant1 2402 -18.66 ≤8.00 PASS BLE_1M Ant1 2440 -18.64 ≤8.00 PASS BLE_1M Ant1 2480 -19.40 ≤8.00 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 11 of 22 Test Graphs BLE_1M-Ant1-2402-PASS BLE_1M-Ant1-2440-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 12 of 22 BLE_1M-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 13 of 22 Appendix E: Band edge measurements Test Result Test Mode Antenna Ch. Name Frequency [MHz] Ref. Level [dBm] Result [dBm] Limit [dBm] Verdict BLE_1M Ant1 Low 2402 -3.34 -49.36 ≤-23.34 PASS BLE_1M Ant1 High 2480 -4.08 -49.65 ≤-24.08 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 14 of 22 Test Graphs BLE_1M-Ant1-2402-PASS BLE_1M-Ant1-2480-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 15 of 22 Appendix F: Conducted Spurious Emission Test Result Test Mode Antenna Frequency [MHz] Freq. Range [MHz] Ref. Level [dBm] Result [dBm] Limit [dBm] Verdict BLE_1M Ant1 2402 0~Reference -2.65 -2.65 --- PASS BLE_1M Ant1 2402 30~1000 -2.65 -72.11 ≤-22.65 PASS BLE_1M Ant1 2402 1000~26500 -2.65 -54.8 ≤-22.65 PASS BLE_1M Ant1 2440 0~Reference -2.64 -2.64 --- PASS BLE_1M Ant1 2440 30~1000 -2.64 -72.57 ≤-22.64 PASS BLE_1M Ant1 2440 1000~26500 -2.64 -56.02 ≤-22.64 PASS BLE_1M Ant1 2480 0~Reference -4.05 -4.05 --- PASS BLE_1M Ant1 2480 30~1000 -4.05 -72.35 ≤-24.05 PASS BLE_1M Ant1 2480 1000~26500 -4.05 -55.76 ≤-24.05 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 16 of 22 Test Graphs BLE_1M-Ant1-2402-0~Reference-PASS BLE_1M-Ant1-2402-30~1000-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 17 of 22 BLE_1M-Ant1-2402-1000~26500-PASS BLE_1M-Ant1-2440-0~Reference-PASS BLE_1M-Ant1-2440-30~1000-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 18 of 22 BLE_1M-Ant1-2440-1000~26500-PASS BLE_1M-Ant1-2480-0~Reference-PASS BLE_1M-Ant1-2480-30~1000-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 19 of 22 BLE_1M-Ant1-2480-1000~26500-PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 20 of 22 Appendix G: Duty Cycle Test Result Test Mode Antenna Frequency [MHz] ON Time [ms] Period [ms] Duty Cycle [%] Duty Cycle Factor [dB] BLE_1M Ant1 2402 19.00 19.00 100.00 0.00 BLE_1M Ant1 2440 19.00 19.00 100.00 0.00 BLE_1M Ant1 2480 19.00 19.00 100.00 0.00 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 21 of 22 Test Graphs NTNV-BLE_1M-Ant1-2402 NTNV-BLE_1M-Ant1-2440 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX Report No.: TZ0015250103FRF02 Page 22 of 22 NTNV-BLE_1M-Ant1-2480

Keychron Technology (Shenzhen) Co., Ltd. 201, Building 2, Wenkeng Industrial Zone, No. 24, Dafa Road, DafaPu Community, Bantian Jie Dao, Longgang District, Shenzhen, China 2.911 (d)(5)(i) Equipment Type Attestation v1.2 Section 2.911(d)(5)(i) Certification – Equipment Type Company name: Keychron Technology (Shenzhen) Co., Ltd. Address: 201, Building 2, Wenkeng Industrial Zone, No. 24, Dafa Road, DafaPu Community, Bantian Jie Dao, Longgang District, Shenzhen, China Product Name: Wireless Keyboard FCC ID: 2BGKB-K4MAX Model(s): K4 Max 2.911(d)(5)(i) Equipment Type We, Keychron Technology (Shenzhen) Co., Ltd. (“the applicant”) certify that the equipment for which authorization is sought through certification is not: • Prohibited from receiving an equipment authorization pursuant to § 2.903; of the FCC rules. • Identified as an equipment type in the “Covered List” NOTE 1 Yours sincerely, Date: February 17, 2025 Name: Nick Xu Title: CEO Company: Keychron Technology (Shenzhen) Co., Ltd. NOTE 1 “Covered List”; is the List of Equipment and Services Covered By Section 2 of The Secure Networks Act, available at https://www.fcc.gov/supplychain/coveredlist References; 1) 986446 D01 Covered Equipment v01 https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=325672 2) Federal Register document 2022-28263 published on 02/06/23 https://www.federalregister.gov/documents/2023/02/06/2022-28263/protecting-against-national-security-threats-to-the-com munications-supply-chain-through-the

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2BGKB-K4MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 3 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: 2BGKB-K4MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 3 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: 2BGKB-K4MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 3 Conducted Power Results TestMode Antenna Frequency[MHz] Result[dBm] BLE Ant1 2402 -2.13 BLE Ant1 2440 -2.15 BLE Ant1 2480 -2.77 TestMode Antenna Frequency[MHz] Result[dBm] SRD Ant1 2402 -3.48 SRD Ant1 2440 -1.73 SRD Ant1 2480 -2.00 Manufacturing tolerance BLE Channel Channel 0 Channel 19 Channel 39 Target (dBm) -2.5 -2.5 -3.5 Tolerance ±(dB) 1 1 1 SRD Channel Channel 0 Channel 19 Channel 39 Target (dBm) -4 -2 -2.5 Tolerance ±(dB) 1 1 1 Results Test Mode Max Conducted Tune Up Power(dBm) Max of ERP and Conducted Power including Tune Up (dBm) Max of ERP and Conducted Power including Tune Up (mW) Exemption Limit(mW) BLE -1.5 -1.5 0.71 3 SRD -1.0 -1.0 0.79 3 Max of ERP and Conducted Power including Tune Up (dBm) = Max Conducted Tune Up Power(dBm) and Max Conducted Tune Up Power(dBm) + Antenna Gain(dBi)-2.15), whichever is greater. The antenna gain of the EUT for BT is 0 dBi (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.

FCC ID:2BGKB-K4MAX Page 1 of 5 Internal Photographs of EUT Fig.1 Fig.2 FCC ID:2BGKB-K4MAX Page 2 of 5 Fig.3 Fig.4 FCC ID:2BGKB-K4MAX Page 3 of 5 Fig.5 Fig.6 Bluetooth antenna FCC ID:2BGKB-K4MAX Page 4 of 5 Fig.7 Fig.8 FCC ID:2BGKB-K4MAX Page 5 of 5 Fig.9

Label Location FCC ID: 2BGKB-K4MAX

FCC ID:2BGKB-K4MAX Page 1 of 4 External Photographs of EUT Fig.1 Fig.2 FCC ID:2BGKB-K4MAX Page 2 of 4 Fig.3 Fig.4 FCC ID:2BGKB-K4MAX Page 3 of 4 Fig.5 Fig.6 FCC ID:2BGKB-K4MAX Page 4 of 4 Fig.7

Keychron Technology (Shenzhen) Co., Ltd. 201, Building 2, Wenkeng Industrial Zone, No. 24, Dafa Road, DafaPu Community, Bantian Jie Dao, Longgang District, Shenzhen, China Letter of Authorization Company name: Keychron Technology (Shenzhen) Co., Ltd. Address: 201, Building 2, Wenkeng Industrial Zone, No. 24, Dafa Road, DafaPu Community, Bantian Jie Dao, Longgang District, Shenzhen, China Product Name: Wireless Keyboard FCC ID: 2BGKB-K4MAX Model(s): K4 Max Product Description: Wireless Keyboard We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning …

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