[All-round Protection] The 12V USB Car Outlet is Certified by UL CE & ROHS, with over-load, over-current, and short circuit protection to ensure charging safety; this USB car charger guards the security of your devices. [Wide Compatibility] Fits for DC 12/24V car, boat, marine, motorcycle, ATV, RV, etc. This USB charger for cars are suitable for charging iPhones, Samsung, iPad, android tablets, power banks, video game controllers, sports watches, etc. [LED Voltmeter Display] Features a blue LED voltmeter; the USB socket automatically monitors the vehicle's battery and the electrical system and indicates the car voltage on the screen. YonHan dual USB charger socket will let you know the battery's health while driving. [Dual QC3.0 USB Ports] With dual supporting QC 3.0 USB ports, the 36W 12V USB port for the car charges two compatible devices up to 4X faster than conventional charging, consistent with QC 2.0/1.0. It delivers the fastest possible charge to all non-Quick charge devices. [Aluminum Alloy Material] The advanced full aluminum alloy body with scratch resistance technology keeps it sturdy and lets the 12v USB outlet always look like new. Upgrade metal USB cigarette lighter sockets will not overheat at high temperatures, which is safer than plastic ones.