1Compatibility-The stereo mini jack connection allows you to enjoy high quality audio from a variety of devices it抯 the best choice for IPOD. 3Digital amplifier technology provides HI-FI, clear and more powerful sound while extending battery life . 4 Special IPOD player jack .it can use 5v/12v transformer which compatible with IPOD player .it is also can be recharging while transmitting date with computer . 5The IPOD player can be controlled within 8 meters .turn on /off .volume +/ -. Pause / play . forward / backward. All this functions can be achieved within 8 meters . 8.Frequency Response:100Hz-20kHz 9. Input Impedance:>10kohm 10. Signal-to-Noise Ratio:≤80dB 11. Battery Powered:3AA batteries or transformer 12. Input:special IPOD jack .3.5mm Mini stereo jack 13. Power Output:2 watts per channel