This neat, compact USB hub is perfect for laptop users as its easy to store and transport. Even though it measures only 4cm across, it still features 4 high speed USB 2.0 ports to support the latest devices such as external hard drives, cameras and printers. It can easily be carried in your case or even in your pocket, making it the ideal choice for notebook users. * Note: This hub is bus powered - it takes its power from the computer\'s USB port. You can use it with both bus-powered USB devices (e.g keyboards, pen drives, MP3 players) and self-powered USB devices (i.e. peripherals with their own power supplies, such as printers and external hard drives). When used with bus-powered peripherals it can support 4 devices with a total power consumption of up to 500mA.