TOP QUALITY CAR USB CHARGER: Dual USB Ports pump out 24W power, up to 4.8 amps or 2.4 amps per port. Great in car phone chargers, USB cigarette car charger. Fast charging iPhone, Samsung, Galaxy, Digital Cameras, Huawei mobile phones, etc. Works for both12v or 24v car, truck, boat and even planes. MULTIPLE PROTECTION: The 12v USB car charger is equipped with multiple chips to protect your devices from over-heat, over-current and over-charging. Top built quality with multiple protection keep your phone battery from any kind of damage. HIGH ACCURACY CAR VOLTAGE METER: Bright LED display monitor the voltage of the vehicle's battery with high accuracy (+-0.2Volt). Its an easy and effective car voltage meter to know the health of your car battery in real time. Easily turn your cigarettelighter into a volt meter with two USB ports! The LED display make the car phone chargers easy to access after dark. COMPACT DESIGN: This mini USB car charger is one of the industry's smallest car USB adapter with voltage meter display, featuring two USB ports. Its pocket sized and is portable for your own or rental car.