ITEM NAME:Portable Car Power Inverter USB Charger Adapter DC 220V 12V/24V AC Converte Q3C5 Description&Preview.Make sure the power indicator is bright. 1 x USB Power Converter. USB output:6V. This product is specially fit to DC 12V-24V car. You can follow below process to chontact us. This product is specially used for cathode grounded car, cant be used foranode grounded car.