Features: 1.High quality, double Nd-Fe-boron magnetism speaker. 2. Unique tube design, with aluminium body. 3. Built-in universal docking station provides recharging option for Ipod Video, Nano and Nano2. 4. Convenient secondary 3.5mm input jack for conection with other audio products. Including latops, mp3 player and PDA, ext. 5.Input: iPod dock(Nano, Nano 2, video) / 3.5 mm mini-stereo jack. 6.Power output: 4 Watt,THD<=10% 7. Signal to noise ratio: 60 dB 8. LED power indicator 9. Power a:) 4xAAA bateries (not included) b:) 9v/1000mA AC switching power supply( included) Standards Certification: FCC-ATE20061041 CE-ATE20061040