Bluetooth Version: V4.2
Battery Type：Lythium
Battery Size：450mAh
Battery Standby Time：Approx 100 hours
Battery Talk/Music Time：Approx 10 hours
Battery Charge Time：Approx 2.5 hours
QDID Number： 91274
Speaker Size Φ: 40 mm                                                               
Frequency Response: 20-20K Hz                                         
 Sensitivity: 99 ± 3 dB                                                           
Impedance: 32 Ohm