Universal Micro USB Car Charger for Galaxy S7, Rapid Charge Heavy Duty Car Charger for Samsung Smartphones (Car Charger) Smart IC chip recognizes a fully charged battery and automatically switches to safe mode to prevent over-charging and short circuit Dual LED tail-light display indicates when a secure power connection is made with your wireless device Powerful 2.1A/10 Watts output conveniently allows you to charge and use your device at the same time Double circuit protection to ensure your device charges safely easy installation