USB car charger This USB car charger has a compact design and a detachable cable, so you can leave it in your car at all times. The TomTom USB car charger has been specifically designed to charge devices with high power requirements faster than standard car chargers. This makes it the 'must have' accessory for all cars, so you can charge your navigation device and other mobile USB devices (like mobile phones and MP3 players) on the go.