Compatibility the stereo mini jack connection allows you to enjoy high quality audio from a variety of audio devices it's the best choice for IPOD. Digital Amplifier Technology provides HI-FI quality sound. Digital amplifier technology while extending battery life. It is also provides clear and more powerful sound. It can use 5v/12v transformer which compatible with IPOD player. It is also can be recharging while transmitting data. Input: special IPOD jack 3.5mm mini stereo jack. Power output: 4 watts (2watts per channel). IPOD charging and data transfer jack. Input impedance: >10K0hm. Sinal-to-Noise Ratio: <80dB. Battery Powered: 3AA batteries or transformer. Dimensions: Length 205mm*width115mm*Height30mm. Weight: 340g. Infrared remote control can be achieved within 8 meters.