Intelligent circuit design supports short circuit, overcurrent and overvoltage protection. Supports DC 12-24V voltage range, suitable for all kinds of cars. Compatible with most phones, tablets, power banks. 2-hole USB interface, 3.1A super current intelligent power distribution, LED charging indication function. Aluminum alloy metal ring, pure copper USB contacts, durable. Intelligent fuse mode, dual-chip high-speed charging. Built-in overcurrent, overvoltage, short circuit protection, turbulence support, charge mode maintenance. Soft aperture, more comfortable to use. Output: 5V/3A, Output interface: USB, Input: 12-24V/2.4A, Power supply: car lighter slot.