product2

1.Drive:40mm
2.Impedance:32 OHM
3.Bluetooth version:Bluetooth v4.0+EDR
4.Power Level:CLASS II
5.Output power:30mW
6.Bluetooth distance:10 meters barrier
7.Frequency response:20-20000 Hz
8.Operating voltage range:3.0V-4.2V
9.Microphone sensitivity:-42dB
10.Charging time is about 1 hour(power indicator charging:blue light lights,fully charged:blue light goes out)
11.Dimensions:Diameter length 20MM.Width 15MM.18MM high 
15.Weight about :4g
16.Talk time about 4 hours
17.Music Time about 3 hours
18.The standby time is about 3-4 days
19.Charging Power:DC5V/1A