Advanced Gomadic 2 in 1 Auto / Car DC Charger Compatible with TomTom Go 300 with Foldable Wall AC Charging plug &ndash; Amazing design built with TipExchange Technology State of the art, advanced circuitry prevents the TomTom Go 300 from being damaged by power surges, overcharging and/or short-circuiting. Broad input voltage range of 12-24VDC and 100-240VAC respectively. Permits charging via vehicle and home outlets worldwide! Intelligent circuit tailors precise output voltage (including resistor configuration) specific to the TomTom Go 300. This ensures battery is safely and efficiently charged. Provides a unique combination of both a Rapid Car Charger and a Rapid Wall Charger in one light and compact design When used in vehicle charging mode, high quality capacitors and circuit components ensure that charging current will not interfere with FM radio reception.