Connect & Charge 4 Port Hub "The 4-port desktop hub features a compact, anti-slip design with three top-loading ports for convenient device connection. ? Powers and connects multiple devices including hard drives, printers, MP3 players and flash drives ? Charges electronic devices such as mobile phones, MP3 players, cameras and ebooks with or without a computer ? On/Off switch provides energy efficiency System Requirements: PC with Windows 2000/XP/Vista/Win7 or Mac OS X v10.2 or above, available USB port Technical Specifications: USB: 2.0 or 1.1, plug & play Power: 5V/2A AC adapter On/Off switch"