Wide Compatibility: This USB socket fits for 12-24V car?? Boat?? Marine?? ATV?? RV etc. Use for mobile phones?? Tablet?? GPS?? digital cameras?? PDAs and other USB accessories</br>Overcharge protection: Charges safely?? without risk of overheating or damaging devices</br>Safety Driving: with LED digital display voltage monitor?? shows the accurate voltage status of device?? prevent your motorcycle or car from starting hard?? off and on intermittently and the headlights not enough br