2ASF4-K3MAXWireless Mechanical Keyboard

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 Bipu Technology Co., Ltd Building 2, Floor 2, Wenkeng Industrial Area, Dafa Road No.24, Bantian, Long Gang District, Shenzhen, Guangdong, China Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 Date: 12/14/2023 U.S. Agent Designation Shenzhen Bipu Technology Co., Ltd acknowledges their consent for the following contact located in the United States to act as their agent for service of process for the equipment for which authorization is sought (FCC ID: 2ASF4-K3MAX): Name and company of U.S. agent: Keychron, Inc. Physical U.S. address of agent: 8 The Green ste a, Dover, DE 19901, United States FRN of U.S. agent: 0033472820 Email address of U.S. agent: [email protected] Keychron, Inc. acknowledges their obligation to accept service of process on behalf of Shenzhen Bipu Technology Co., Ltd. Shenzhen Bipu Technology Co., Ltd with the FRN [0028221521] accepts its obligation to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission-related administrative or judicial proceeding involving the equipment, whichever is later. By signing this form, we confirm the above and that we are aware of the application requirements listed under § 2.911(d)(7). The information provided in this letter is based on the referenced rule parts of Title 47 of the CFR as well as KDB 986446 D01. An expiration date for this letter does not exist. In case the U.S. agent changes, the grantee is obligated to notify the FCC within 30 days via the granting TCB. Sincerely, Signature Nick Xu Shenzhen Bipu Technology Co., Ltd Signature Nick Xu CEO Keychron, Inc. 48_[model] US_Agent_2.911(d)(7) - U, V05

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 3 EXTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX 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 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX 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

Label Location: FCC ID: 2ASF4-K3MAX 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.

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 1 of 5 INTERIOR PHOTOGRAPHS OF EUT Fig.1 Fig.2 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 2 of 5 Fig.3 Fig.4 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 3 of 5 Fig.5 Fig.6 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 4 of 5 Fig.7 Fig.8 Bluetooh/SRD Antenna Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX This report shall not be reproduced except in full, without the written approval of Shenzhen Tongzhou Testing Co.,Ltd Page 5 of 5 Fig.9

TestReport ForAntenna1 Tested Products. • Antenna1: integrated antenna. • Frequency = 2.402GHz. • Frequency = 2.441GHz. • Frequency = 2.480GHz. Antenna1 Photo&Length(mm) Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. XZ Plane at f = 2.402GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 0 45 -5 -10 -15-10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. YZ Plane at f = 2.402GHz 180 135 90 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 90 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. XY Plane at f = 2.402GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. XZ Plane at f = 2.441GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. YZ Plane at f = 2.441GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0180 135 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. XY Plane at f = 2.441GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. XZ Plane at f = 2.480GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. YZ Plane at f = 2.480GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 Co-crosspolarizationfield(dBi) Solid line: vertical polarization Dash line: horizontal polarization Totalfield(dBi) Radiation pattern: Antenna 1. XY Plane at f = 2.480GHz 90 90 180 135 0 -5 45 -10 -15 -20 -25 -30 -35-30 -25 -20 -15 -10 -50 0 180 135 0 45 -5 -10 -15 -10-50 0 225315 225315 270 270 R e t ur n L o s s ( d B ) ReturnLoss:Antenna1 -2 -4 -6 -8 -10 -12 -14 -16 22.22.42.62.83 Frequency(GHz) BW(-10dB) 13.48% MAXGain1.87dBi Measurementssummary Frequency(GHz)PlaneReturnLoss(dB)PolarizationGainmax.(dBi)θ forGainmax.φforGainmax. Antenna 1 2.402XZ-10.90Vertical-7.8290 2.402XZ-10.90Horizontal0.786182 2.402YZ-10.90Vertical1.21226 2.402YZ-10.90Horizontal-7.7510 2.402XY-10.90Vertical-15.420 2.402XY-10.90Horizontal0.93180 2.441XZ-12.20Vertical-7.36318 2.441XZ-12.20Horizontal1.32180 2.441YZ-12.20Vertical0.981204 2.441YZ-12.20Horizontal-8.2324 2.441XY-12.20Vertical-14.1-14 2.441XY-12.20Horizontal1.74180 2.48XZ-13.80Vertical-7.95312 2.48XZ-13.80Horizontal1.81186 2.48YZ-13.80Vertical0.204214 2.48YZ-13.80Horizontal-8.388 2.48XY-13.80Vertical-15.812 2.48XY-13.80Horizontal1.87180

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 1 of 19 Appendix Test Data for BT(BLE) (Conducted Measurement) Product Name: Wireless Mechanical Keyboard Trade Mark: Keychron Test Model: K3 Max FCC ID: 2ASF4-K3MAX 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: DTS Bandwidth Test Result TestMode Antenna Channel DTS BW [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict BLE_1M Ant1 2402 0.672 2401.676 2402.348 0.5 PASS 2440 0.672 2439.676 2440.348 0.5 PASS 2480 0.684 2479.680 2480.364 0.5 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 2 of 19 Test Graphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 3 of 19 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Channel OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict BLE_1M Ant1 2402 1.0253 2401.4982 2402.5235 --- --- 2440 1.0423 2439.4887 2440.5310 --- --- 2480 1.0277 2479.4938 2480.5215 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 4 of 19 Test Graphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 5 of 19 Appendix C: Maximum Peak conducted output power Test Result TestMode Antenna Channel Result[dBm] Limit[dBm] Verdict BLE_1M Ant1 2402 1.22 ≤30 PASS 2440 1.33 ≤30 PASS 2480 1.31 ≤30 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 6 of 19 Test Graphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 7 of 19 Appendix D: Maximum power spectral density Test Result TestMode Antenna Channel Result[dBm/3-100kHz] Limit[dBm/3kHz] Verdict BLE_1M Ant1 2402 -10.57 ≤8.00 PASS 2440 -9.91 ≤8.00 PASS 2480 -10.73 ≤8.00 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 8 of 19 Test Graphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 9 of 19 Appendix E: Band edge measurements Test Result TestMode Antenna ChName Channel RefLevel[dBm] Result[dBm] Limit[dBm] Verdict BLE_1M Ant1 Low 2402 0.65 -49.32 ≤-19.35 PASS High 2480 0.73 -49.24 ≤-19.27 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 10 of 19 Test Graphs BLE_1M_Ant1_Low_2402 BLE_1M_Ant1_High_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 11 of 19 Appendix F: Conducted Spurious Emission Test Result TestMode Antenna Channel FreqRange [MHz] RefLevel [dBm] Result[dBm] Limit[dBm] Verdict BLE_1M Ant1 2402 Reference 0.89 0.89 --- PASS 30~1000 0.89 -61.96 ≤-19.11 PASS 1000~26500 0.89 -46.98 ≤-19.11 PASS 2440 Reference 0.41 0.41 --- PASS 30~1000 0.41 -62.08 ≤-19.59 PASS 1000~26500 0.41 -46.11 ≤-19.59 PASS 2480 Reference 0.45 0.45 --- PASS 30~1000 0.45 -61.89 ≤-19.55 PASS 1000~26500 0.45 -47.68 ≤-19.55 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 12 of 19 Test Graphs BLE_1M_Ant1_2402_0~Reference BLE_1M_Ant1_2402_30~1000 BLE_1M_Ant1_2402_1000~26500 BLE_1M_Ant1_2440_0~Reference Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 13 of 19 BLE_1M_Ant1_2440_30~1000 BLE_1M_Ant1_2440_1000~26500 BLE_1M_Ant1_2480_0~Reference Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 14 of 19 BLE_1M_Ant1_2480_30~1000 BLE_1M_Ant1_2480_1000~26500 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 15 of 19 Appendix G: Duty Cycle Test Result TestMode Antenna Channel Transmission Duration [ms] Transmission Period [ms] Duty Cycle [%] 1/T[kHz] BLE_1M Ant1 2402 0.00 0.00 100 0.01 2440 0.00 0.00 100 0.01 2480 0.00 0.00 100 0.01 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 16 of 19 Test Graphs BLE_1M_Ant1_2402 BLE_1M_Ant1_2440 BLE_1M_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 17 of 19 Appendix H: Emissions in Restricted Bands Test Result TestMode Antenna ChName Channel Detector Freq. [MHz] Result [dBm] Limit [dBm] Verdict BLE_1M Ant1 Low 2402 AV 2310.000 -49.4 ≤-41.20 PASS AV 2389.565 -49.11 ≤-41.20 PASS AV 2390.000 -49.12 ≤-41.20 PASS Peak 2310.000 -42.95 ≤-21.20 PASS Peak 2374.340 -40.12 ≤-21.20 PASS Peak 2390.000 -43.8 ≤-21.20 PASS High 2480 AV 2483.500 -48 ≤-41.20 PASS AV 2483.520 -48 ≤-41.20 PASS AV 2500.000 -48.38 ≤-41.20 PASS Peak 2483.500 -42.38 ≤-21.20 PASS Peak 2499.680 -39.53 ≤-21.20 PASS Peak 2500.000 -43.84 ≤-21.20 PASS Note： 1. The Antenna Gain is compensated in the graph with 2dBi and Antenna Gain which is Higher. 2. The limit in dBm for average detector is conversion from 54dBuV/m, according to 15.209(a). The limit in dBm for peak detector is 20dB above the limit of average detector in dBm. Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 18 of 19 Test Graphs BLE_1M_Ant1_Low_2402_AV BLE_1M_Ant1_Low_2402_Peak BLE_1M_Ant1_High_2480_AV BLE_1M_Ant1_High_2480_Peak Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E1 Page 19 of 19

Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 1 of 19 Appendix Test Data for SRD (Conducted Measurement) Product Name: Wireless Mechanical Keyboard Trade Mark: Keychron Test Model: K3 Max FCC ID: 2ASF4-K3MAX 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: DTS Bandwidth Test Result TestMode Antenna Channel DTS BW [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict SRD Ant1 2402 1.336 2401.360 2402.696 0.5 PASS 2440 1.424 2439.308 2440.732 0.5 PASS 2480 1.256 2479.380 2480.636 0.5 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 2 of 19 Test Graphs SRD_Ant1_2402 SRD_Ant1_2440 SRD_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 3 of 19 Appendix B: Occupied Channel Bandwidth Test Result TestMode Antenna Channel OCB [MHz] FL[MHz] FH[MHz] Limit[MHz] Verdict SRD Ant1 2402 2.0310 2400.9957 2403.0267 --- --- 2440 2.0202 2438.9959 2441.0161 --- --- 2480 2.0378 2478.9929 2481.0307 --- --- Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 4 of 19 Test Graphs SRD_Ant1_2402 SRD_Ant1_2440 SRD_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 5 of 19 Appendix C: Maximum Peak conducted output power Test Result TestMode Antenna Channel Result[dBm] Limit[dBm] Verdict SRD Ant1 2402 1.62 ≤30 PASS 2440 1.45 ≤30 PASS 2480 1.31 ≤30 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 6 of 19 Test Graphs SRD_Ant1_2402 SRD_Ant1_2440 SRD_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 7 of 19 Appendix D: Maximum power spectral density Test Result TestMode Antenna Channel Result[dBm/3-100kHz] Limit[dBm/3kHz] Verdict SRD Ant1 2402 -11.69 ≤8.00 PASS 2440 -12.75 ≤8.00 PASS 2480 -12.24 ≤8.00 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 8 of 19 Test Graphs SRD_Ant1_2402 SRD_Ant1_2440 SRD_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 9 of 19 Appendix E: Band edge measurements Test Result TestMode Antenna ChName Channel RefLevel[dBm] Result[dBm] Limit[dBm] Verdict SRD Ant1 Low 2402 -0.36 -33.67 ≤-20.36 PASS High 2480 -0.04 -49.71 ≤-20.04 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 10 of 19 Test Graphs SRD_Ant1_Low_2402 SRD_Ant1_High_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 11 of 19 Appendix F: Conducted Spurious Emission Test Result TestMode Antenna Channel FreqRange [MHz] RefLevel [dBm] Result[dBm] Limit[dBm] Verdict SRD Ant1 2402 Reference -0.62 -0.62 --- PASS 30~1000 -0.62 -63.07 ≤-20.62 PASS 1000~26500 -0.62 -44.19 ≤-20.62 PASS 2440 Reference -1.51 -1.51 --- PASS 30~1000 -1.51 -61.97 ≤-21.51 PASS 1000~26500 -1.51 -43.25 ≤-21.51 PASS 2480 Reference -1.16 -1.16 --- PASS 30~1000 -1.16 -62.78 ≤-21.16 PASS 1000~26500 -1.16 -46.13 ≤-21.16 PASS Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 12 of 19 Test Graphs SRD_Ant1_2402_0~Reference SRD_Ant1_2402_30~1000 SRD_Ant1_2402_1000~26500 SRD_Ant1_2440_0~Reference Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 13 of 19 SRD_Ant1_2440_30~1000 SRD_Ant1_2440_1000~26500 SRD_Ant1_2480_0~Reference Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 14 of 19 SRD_Ant1_2480_30~1000 SRD_Ant1_2480_1000~26500 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 15 of 19 Appendix G: Duty Cycle Test Result TestMode Antenna Channel Transmission Duration [ms] Transmission Period [ms] Duty Cycle [%] 1/T[kHz] SRD Ant1 2402 0.00 0.00 100 0.01 2440 0.00 0.00 100 0.01 2480 0.00 0.00 100 0.01 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 16 of 19 Test Graphs SRD_Ant1_2402 SRD_Ant1_2440 SRD_Ant1_2480 Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 17 of 19 Appendix H: Emissions in Restricted Bands Test Result TestMode Antenna ChName Channel Detector Freq. [MHz] Result [dBm] Limit [dBm] Verdict SRD Ant1 Low 2402 AV 2310.000 -49.87 ≤-41.20 PASS AV 2389.670 -49.61 ≤-41.20 PASS AV 2390.000 -49.62 ≤-41.20 PASS Peak 2310.000 -42.66 ≤-21.20 PASS Peak 2348.405 -40.09 ≤-21.20 PASS Peak 2390.000 -43.81 ≤-21.20 PASS High 2480 AV 2483.500 -45.23 ≤-41.20 PASS AV 2483.520 -45.23 ≤-41.20 PASS AV 2500.000 -48.89 ≤-41.20 PASS Peak 2483.500 -40.8 ≤-21.20 PASS Peak 2491.200 -40.31 ≤-21.20 PASS Peak 2500.000 -42.52 ≤-21.20 PASS Note： 1. The Antenna Gain is compensated in the graph with 2dBi and Antenna Gain which is Higher. 2. The limit in dBm for average detector is conversion from 54dBuV/m, according to 15.209(a). The limit in dBm for peak detector is 20dB above the limit of average detector in dBm. Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 18 of 19 Test Graphs SRD_Ant1_Low_2402_AV SRD_Ant1_Low_2402_Peak SRD_Ant1_High_2480_AV SRD_Ant1_High_2480_Peak Shenzhen Tongzhou Testing Co.,Ltd FCC ID: 2ASF4-K3MAX Report No.: TZ231105093-E2 Page 19 of 19

Report No.: TZ231105093-E1 Page 1 of 34 FCC TEST REPORT Test report On Behalf of Shenzhen Bipu Technology Co., Ltd For Wireless Mechanical Keyboard Model No.: K3 Max FCC ID: 2ASF4-K3MAX Prepared for : Shenzhen Bipu Technology Co., Ltd Building 2, Floor 2, Wenkeng Industrial Area, Dafa Road No.24, Bantian, Long Gang District, Shenzhen, Guangdong, 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: 2023/11/13~2023/11/28 Date of Report: 2023/11/30 Report Number: TZ231105093-E1 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.: TZ231105093-E1 Page 2 of 34 TEST RESULT CERTIFICATION Applicant’s name ................. : Shenzhen Bipu Technology Co., Ltd Address .................................. : Building 2, Floor 2, Wenkeng Industrial Area, Dafa Road No.24, Bantian, Long Gang District, Shenzhen, Guangdong, China Manufacture's Name ............ : Shenzhen Bipu Technology Co., Ltd Address .................................. : Building 2, Floor 2, Wenkeng Industrial Area, Dafa Road No.24, Bantian, Long Gang District, Shenzhen, Guangdong, China Product description Trade Mark ............................. : Keychron Product name ......................... : Wireless Mechanical Keyboard Model and/or type reference : K3 Max 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 ............. : 2023/11/13~2023/11/28 Date of Issue .......................................... : 2023/11/30 Test Result .............................................. : Pass Testing Engineer : (Anna Hu) Technical Manager : (Hugo Chen) Authorized Signatory : (Andy Zhang) Report No.: TZ231105093-E1 Page 3 of 34 Revision History Revision Issue Date Revisions Revised By 000 2023/11/30 Initial Issue Andy Zhang Report No.: TZ231105093-E1 Page 4 of 34 TABLE OF CONTENTS 1. GENERAL INFORMATION ................................................................................................................................... 5 1.1. DESCRIPTION OF DEVICE (EUT) ........................................................................................................................ 5 1.2 EUT CONFIGURATION .......................................................................................................................................... 6 1.4. DESCRIPTION OF TEST FACILITY ........................................................................................................................ 6 1.5. STATEMENT OF THE MEASUREMENT UNCERTAINTY .......................................................................................... 7 1.6. MEASUREMENT UNCERTAINTY ........................................................................................................................... 7 1.7. DESCRIPTION OF TEST MODES .......................................................................................................................... 7 1.8. FREQUENCY OF CHANNELS ................................................................................................................................ 7 2. TEST METHODOLOGY ......................................................................................................................................... 8 2.1. EUT CONFIGURATION......................................................................................................................................... 8 2.2. EUT EXERCISE ................................................................................................................................................... 8 2.3. GENERAL TEST PROCEDURES ........................................................................................................................... 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 .............................................................................................................................. 9 3.6. TEST SETUP ........................................................................................................................................................ 9 4. SUMMARY OF TEST RESULTS ........................................................................................................................ 10 5. TEST RESULT ....................................................................................................................................................... 11 5.1. ON TIME AND DUTY CYCLE ...............................................…

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Report No.: TZ231105093-E2 Page 1 of 36 FCC TEST REPORT Test report On Behalf of Shenzhen Bipu Technology Co., Ltd For Wireless Mechanical Keyboard Model No: K3 Max FCC ID: 2ASF4-K3MAX Prepared for : Shenzhen Bipu Technology Co., Ltd Building 2, Floor 2, Wenkeng Industrial Area, Dafa Road No.24, Bantian, Long Gang District, Shenzhen, Guangdong, 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: 2023/11/13~2023/11/28 Date of Report: 2023/11/30 Report Number: TZ231105093-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.: TZ231105093-E2 Page 2 of 36 TEST RESULT CERTIFICATION Applicant’s name ................. : Shenzhen Bipu Technology Co., Ltd Address .................................. : Building 2, Floor 2, Wenkeng Industrial Area, Dafa Road No.24, Bantian, Long Gang District, Shenzhen, Guangdong, China Manufacture's Name ............ : Shenzhen Bipu Technology Co., Ltd Address .................................. : Building 2, Floor 2, Wenkeng Industrial Area, Dafa Road No.24, Bantian, Long Gang District, Shenzhen, Guangdong, China Product description Trade Mark: Keychron Product name ........................... : Wireless Mechanical Keyboard Model and/or type reference : K3 Max 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 ............. : 2023/11/13~2023/11/28 Date of Issue .......................................... : 2023/11/30 Test Result .............................................. : Pass Testing Engineer : (Anna Hu) Technical Manager : (Hugo Chen) Authorized Signatory : (Andy Zhang) Report No.: TZ231105093-E2 Page 3 of 36 Revision History Revision Issue Date Revisions Revised By 000 2023/11/30 Initial Issue Andy Zhang Report No.: TZ231105093-E2 Page 4 of 36 TABLE OF CONTENTS 1. GENERAL INFORMATION ................................................................................................................................... 5 1.1. DESCRIPTION OF DEVICE (EUT) ........................................................................................................................ 5 1.2 EUT CONFIGURATION .......................................................................................................................................... 6 1.3. EXTERNAL I/O CABLE ......................................................................................................................................... 6 1.4. DESCRIPTION OF TEST FACILITY ........................................................................................................................ 6 1.5. STATEMENT OF THE MEASUREMENT UNCERTAINTY .......................................................................................... 7 1.6. MEASUREMENT UNCERTAINTY ........................................................................................................................... 7 1.7. DESCRIPTION OF TEST MODES .......................................................................................................................... 7 1.8. FREQUENCY OF CHANNELS ................................................................................................................…

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