Fantech whg02 wireless headset harmony

Driver size : 50mm
Speaker Sensitivity : 111+-3dB
Frequency Response : 20-20kHz
Impedance : 32+-15%
Microphone Sensitivity : -42+-3dB
Microphone Directivity : Omni-Directional
Microphone Impedance : 2.2K Ohm(MAX)
Micropgone Dimension : 4.0x1.5mm
Bluetooth Range : 30m
2.4G Wireless Range : 15m
Connection : 3.5mm TRRS jack
Battery life : 41 hours