Cellet 3400mA (3.4 Amps) Universal Rapid Dual Port USB Car Charger - Black Charge two tablets or a tablet and smartphone simultaneously Provides over 1 amp of power per each USB port (3.4 amps total) Smart circuit technology protects against overcharging, overheating and overcurrent Input: DC 12V/24V Output: DC 5V/3.4Ah Use your existing USB charging cables to charge most USB powered devices