MiLi 2.1Amp Black/Blue Power Charging Station for Mobile Phones Car charger: 12V to 24V DC Travel charger: 100 to 240V AC Output: USB DC 5V/500mAh x 2 Ripple voltage: less than 100mV Operating efficiency: greater than 85% End charging current: 100mAh Over-current protection Short-circuit protection 1 Year Manufacturer Warranty