USB input: 5V / 2A, cigarette lighter socket output: 12V / 8W Max. The cable length is 30cm (12inch). USB Port Power Converter: Convert USB port power to 12V car cigarette lighter socket. Easy to power your car electronic equipments by extra power (like power bank). Easy use for your E-dog DVR dash cam, you can connect dash cam with 5V mobile power. Never worry about the car power supply, the dash cam can work even if the car is not working. USB Car Cigarette Lighter Socket USB Female Converters are small and easy to carry when you go on a trip. They reduce heat and keep a long working time. The PCB panel part is molded by PVC which is not easy to be damaged. NOTICE: port USB port: input device must meet 5V/2A. Socket Cigarette lighter socket: the product device requires 12V / 8W to operate instead of above or below, the current must also be below 0.8A.