1.Speaker diameter: φ40 milimeters 
2.Impedance: 32 Ohms
3.Sensitivity: 108dB S.P.L.at 1KHz；
4.Rated power:20mW
5.Aggregate capability:50mW
6.Frequency Response:20Hz-20,000Hz 7.Microphone Unit:φ4*1.5mm
8.Impedance:≤2.2KOhms
9.Frequancy Response:30Hz-16,000Hz
10.Operating voltage:4.5V   
11.Charing Time:1.5 hours
12.Talking time:8 hours
13.Battery Capacity:310MA