Features: 1) Speaker size: 25mm 2) Frequency response: 275Hz - 20kHz 3) Output power: 3W 4) Power supply: DC 3.0V (2 x AA battery) 5) Battery life: about 7 hours 6) Audio frequency line: 250mm 7) Pin: 3.5mm L type 8) Dimensions: 135 x 103 x 65mm (optional) 9) Weight: 220g