SPECIFICATION 1.Input : special iPod jack 3.5mm Mini stereo jack 2.Power Output : 4 watts (2watts per channel) 3.Frequency Response : 100Hz-20kHz 4.Input Impedance :>10kohm 5.Signal-to-Noise Ratio : <=80dB 6.Battery Powered : 3 AA batteries or transformer 7.Dimension : Length 205 mm x Width 115 mm x Height 30 mm 8.Weight : 340g 9.Infrared remoto control can be achieved within 8 meters. DESRIPTION patibility-The stereo jack connection allows you to enjoy high quality audio from a variety of audio devices it's the best choice for iPod. 2.Digital Amplifier Technology provides HI-FI quality sound. 3.Digital amplifier technology while extending battery life. It is also provides clear, and more powerful sound. 4.It can use 5v/12v transformer which compatible with iPod player. It is also can be recharging while transmitting data.