GOOLOO Dual USB Port Car Charger Cup Holder 2 Sockets Cigarette Lighter Splitter with Monitor Car Voltage Best LED Display Unique Cup-Shaped Design: Save space,enough for personal fridge & simultaneous use of a variety of portable appliances in your vehicle. On/off switch for each Cigarette Lighter Socket Dual USB Ports: automatically detects your devices to deliver its optimal charging speed up to 3.1A in total, great for your iPhones, iPads, tablets, MP3 players, cameras, and other mobile devices. LED Display:Digital LED displays device's charging current and the voltage of the vehicle's car battery. Safety: CE, FCC, and RoHS certifications, built with technology and components to provide safe charging and protection from over-current, over-heating, over-voltage, and short-circuits