1. Aluminium Alloy shell has strong anti-interference ability. 2. Compatible with USB 1.1 / 2.0. 3. No external power supply required. You should install driver before use. 4. Share your USB peripheral devices between 4 computers. 5. Easy to switch: Automatically switch (via button on the sharing switch) or Manually switch (via PC software / keyboard Hot Key CTRL+F11). 6. USB-A Port can be connected with printer, scanner, plotter, etc. 7. Support for Windows 98/Me/2000/XP, for MAC/MAC 10. Specification: Color: Silver Material: Aluminium Alloy Port: USB Type-B Port for PC * 2 USB Type-A Port * 1 Indicator Light * 2 Convert Way: Hot Key Power Supply: via USB Type-B from PC Temperature: 0~40℃ Storage Temperature: -20~60℃ Humidity: 0~80℃ Size: 10.1 * 5.2 * 2cm / 4.0 * 2.0 * 0.8in Package Weight: approx. 238g Package List: 1 * Sharing Switcher 1 * CD 1 * User Manual Note: 1. Win 7 do not support Hot Key, you can convert via the icon on the task bar. 2. High quality USB cable is recommanded, to ensure the stable and reliable connection. Poor quality of cable may cause the signal attenuation, and PC will not recognize the connecting peripheral. The shorter the cable, the better effect.