[Dual QC 3.0 USB Ports] Equipped with high quality dual QC 3.0 USB ports, it charges two compatible devices up to 4x faster than traditional charging and is compatible with QC 2.0/1.0. It also provides the fastest charging for all non-fast charging devices. [Aluminum Material] The advanced all-aluminum body with scratch-resistant technology keeps it sturdy and keeps the 12v USB outlet looking like new forever. The upgraded metal USB cigarette lighter socket will not overheat at high temperatures, which is safer than plastic ones. [LED Voltmeter Display] Features a blue LED voltmeter that automatically monitors the vehicle's battery and electrical system and displays the car's voltage on the screen. The Hapytrip dual USB charger receptacle lets you know the health of your battery while you drive. [New Push Button Switch] The new version is designed with a push button switch that can be turned on or off at any time. Avoid repeated plugging and unplugging of the charging ca