Rapid Car Charger with Blue Led Display Screen /Portable Intelligent Dual USB Port with Low Voltage Alarm(Black/ ABS) This Car Charger has intelligent electric current output control, it will assign current according to equipment needed automatically, and also adjust the output according to the equipment power saturation. This car charger has a intelligent low voltage alarm function,if using 12.5v, it will alarm when voltage &lt; 11.7v, and it will alarm when voltage &lt;17.5-23.5v if using 24v. Dual USB car charger, the dual smart USB ports quickly and easily identify your mobile devices, to provide superior charging efficiency Portable Travel Charger allows you to charge mobile phones, tablets, music players, etc. Enjoy your electronic devices on the trip This Car Charger is reliable and safe, with an intelligent IC chip, it will protect against overheating, overcurrent, and overcharging. Charging will stop automatically when battery is full