This device is to change flat surface (glass or table) into the speaker by vibration. It is good for interior as it has fashionable look. It supplies power by connecting to USB ports of your desktops or laptops. Then all you have to do is connecting to music players. *If you use USB AC charger (sold separately), it can be used without PC. [color] white [input terminal] USB (Mini-B), 3.5mm stereo mini-jack x1 [cable length] 1.5m [size] W81mm x H119mm [interface] USB 1.1/2.0 [weight] 390g