Specially designed double connector for MP3 attachment  Equipped with 2 stereo input jack sockets  USB output connector to charge MP3 players  Output power: 3W x 2  Optional use with battery: 4 x AAA (6.0V)  High precision drivers Drive units: 35mm x 2  Impedance: 4 ohms  THD: Frequency 100Hz to 20kHz  System response: 60 to 18,000Hz, +/- 3dB  Dimensions: 160 x 100 x 28mm  Weight: 260g  Material: ABS  Color: white, black, red