Intelligent Charging - Quick charge 3.0 USB port, built-in smart charging IC, will auto detects your devices and charges them at optimal speed, better charging performance; QC 3.0 Backward-compatible with QC 2.0, 1.0, provides standard charging for non-Quick Charge devices. QC3.0 car socket can charger two devices at same time. Output: 18W / 3A. More faster than USB 2.0. You can charge your pad, mobile phones, digital camera, GPS, tablet, MPS, or any other devices. Easy to install. "+" is plugged into positive pole and "-" is put on negative pole. Universally suitable for most 12V/24V Vehicles, Cars, SUVs, Motorcycles, Bus, Boats, RV. Input:12V/24V (9-36V) DC, Output:USB A 5V 2.1A, TYPE-C 5V 3A. Safety Protection - Over-heated, over-current, over-charging protection, charging will be automatically stop when battery is full. If have any problem, pls don't hesitate to contact us.