Bluetooth Specs : 2.1+EDR  (CSR BC57E) 
Bluetooth Profile :A2DP;AVRCP;HFP  
Operation Distance : Up to 10M 
Output Power  :3.2W*2 
Lithium battery  :3.7V 1200mAH 
Playback time : Up to 8 hours 
Charging time  :2-3 Hours  
Frequency Response :50HZ-20KHZ 
S/N Ratio :(79)± 2dB.
Input Sensitivity :600mv RMS 
Distortion :  <=10%