Bone conduction in-ear wireless bluetooth headset

Name: New Concept Bluetooth Headset
Bluetooth: version 5.0
Bluetooth distance: 15 meters
Battery capacity: 1 50mAh
Waterproof rating: IP55
Battery voltage: 3.7V
Shell material: injection molding PC+ABS
Standby time: 10 days
Speaker impedance: 8th +3dB
Playing time: 6 hours (standard state)
Memory wire: Nitinol steel wire
Charging method: Micro USB interface
Frequency response: 80-20kHZ
Appearance size: 133*97*46mm (reference)
Charging input standard: DC 5V--- 500mA
Microphone sensitivity: -42+2dB
Charging time: 2 hours