MICTUNING Quick Charge Car Charger with Dual QC3.0 USB Ports and LED Digital Voltmeter! Dual QC3.0 Fast Charging Port which Charge Two Devices Simultaneously, no longer have to worry about a port is not enough. Your friends or family can also get their phones charged together when travelling. Features blue LED voltmeter which monitors the vehicle’s battery automatically and indicating the car voltage on the screen. It enable you know the health of battery in time, prevent problems caused by high/low voltage uses while driving. With a dual-color charging light reminder function. When the engine started, the body outer frame emits ice-blue light. When charging, the illumination changes from ice-blue to red; when charging is complete, the illumination changes back to ice-blue. Keeps Charging.