Stereo bony car headset

Type: Bluetooth bone conduction headset version: bt4.1
Horn: bone conduction microphone sensitivity: 88 k3db
Microphone: analog signal sensitivity: - 42 k3db
Frequency response range: 50 ~ 20kHz, charging interface: support, micro 5pin
Battery: Li battery, 230mah, charging time: 2h
Standby time: ≥ 7d