Car Lighter Charger Adapter for TomTom N14644 125/310 XL XXL GO GPS Unit Fit for most all cars cigarette lighter socket Compatible with both 12 VDC and 24 VDC systems Smart I/C Chip technology prevents overcharging. LED indicator lights up when charger is ready and powered. Extends out to 4' long ou may or may not be able to use the Garmin GPS while charging, it depends on the Car lighter power output