Product Features:
Built-in Bluetooth 2.1 + EDR wireless module. 
Bluetooth audio sound, perfect sound quality and bass effect. 
10M transmission distance. Support phone, ipod and other devices with bluetooth function. 
Bluetooth hands free function, answer call easily. Bluetooth music controlling function. 
Built-in rechargeable Li-ion battery, lasts for up to about 7 hours per charge.
 
Technical parameters: 
Rated impedance: 4.0hm 
Rated power: 3W 
Rated voltage: DC5V 
Frequency response: 3dB 
RMS: 1.2W 
Frequency scope: 170-15KHz 
Power supply: DC 5V Built-in Li-ion battery 
Speaker: 2 inches