The USB Mad Dogs Speaker may drive your cat crazy !! Features: Power by USB port. Built-in stereo amplifier. Dual 4cm speaker with 3.5mm audio jack cable. High quality sound with a 2W+2W power output. Frequency arrange: 120Hz ~ 20KHz Signal Noise Ratio: 86dB Apply to any audio devices with 3.5mm headjack, e.g. PC, Mac, iPod, PDA, MP3 player, CD player ... etc. Support Windows XP/2000/ME/98SE, Mac OS with USB port. Simple, just plug-in, no driver install. Size: 103 x 90 x 113mm Weight: 269gm Cable length: 115cm