Genius HS-905BT, Voice Clip Bluetooth Stereo Headset, rechargeable

Frequency response 20Hz~20KHz
Sensitivity 105dB +/- 3dB
Impedance 16ohm
Driver unit φ10mm
3.5mm/USB 3.5mm
Gold plate plug YES
Technical Specification:

Bluetooth: 
-BT: BT2.1+EDR 
-A2DP (Advanced Audio Distribution Profile) 
-Headset and hands-free profiles for phone
Headset: 
-Sensitivity: 105dB +/- 3dB 
-Frequency response: 20Hz~20KHz 
-Unit driver: φ10mm 
-Impedance: 16ohm
Microphone: 
-Sensitivity: -40 +/- 3dB 
-Frequency response: 100~10KHz 
- Impedance: 2.2k ohm 2VDCs