Product Features: 1. Built-in Bluetooth 2.1 + EDR wireless module. 2. Bluetooth audio sound， perfect sound quality and bass effect. 3. 10M transmission distance. Support phone， ipod and other devices with bluetooth function. 4. Bluetooth hands free function， answer call easily. Bluetooth music controlling function. 5. Built-in rechargeable Li-ion battery， lasts for up to about 7 hours per charge.6. 3.5audio input jack 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 Package��1 x speaker w Packing Box