The LINDY USB Cable Hub adds 4 USB 2.0 ports to your computer, but unlike conventional USB hubs the ports are not fixed into a housing. The cabled USB ports offer more flexibility, no longer are you limited by the gap between ports when connecting USB accessories to your computer. Furthermore, for your convenience, there is a USB Micro-B male connector for quick and easy connection to MP3 players, mobile phones and drive housings. * 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.