REMAX RB-S2 Bluetooth Headset 

Bluetooth: V4.1+EDR

Profile Support: HSP/HFP/A2DP/AVRCP

Frequency Response:20-20kHz

Impedance: 16?; Sensitivity(SPL): 92±3db

Profile Support: HSP/HFP/A2DP/AVRCP

Operating distance: up to 10m (free space)

Talk/Music time: up to 6 hrs

Standby time: 200 hrs; Charger time: 2 hrs