The hama usb travel charger is so simple to use all you need to do to charge your usb device is attach the relevant adapter plug it in to any mains socket and then plug in your device via its usb connection cable for fast and efficient power this charger is ideal for sat navs and popular brands of mp3 players such as philips samsung and apple rrthe hama usb travel charger is ultra compact and portable so it can also easily fit in your bag or luggage and weighs very little a lot less tha