■Product type: TWS Bluetooth headset ■Bluetooth program: JL7003D8 Jerry ■Bluetooth version: 5.4 ■Sound system: stereo ■Control mode: touch ■Built-in battery: headset lithium battery 3.7V/35mAh case: 3.7V/400mAh polymer ■Charging input standard: DC5V-1A ■Music playback time: about 6 hours (60% volume) ■Charging time: headset charging time: about 1.5 hours. Charging time: about 2 hours. ■Talk time: about 3 hours ■Support noise cancellation: ANC +ENC; depth 18-25 dB ■ Bluetooth effective distance: ≥ 10 meters ■ Headset maximum power: 3 mW ■ Speaker sensitivity curve: 118 dB ±3 dB (at 1 kHz) ■ Microphone sensitivity: silicon microphone -38 dB ± 3 dB ■ Frequency response: 20 Hz ~ 20 kHz ■ Speaker: 13 mm 32 ohms ■ Maximum transmission power: 1.66 dBi ■ Bluetooth protocol support: A2DP, AVDTP, AVRCP, RFCOMM, HFP, HSP, SPP ■ Bluetooth operating frequency: 2.402 GHz-2.480 GHz ■ Headset radio frequency power level: Class2 ■ Voice prompts: English by default ■ Product material: ABS ■ Product size: 61.9*29.3*51 mm