Fast charger 2.1a and 1 a and input voltage: 12v-24v. Can charge 2 phones at the same time by using both the usb sockets simultaneously. Universal: works with all mobile phones/ cars/ trucks/ bus. Dual USB ChargerDesigned with dual USB ports supporting charge, since its max single output is 2.1A. Built-in smart IC, will auto detect your devices and simultaneously charging 2 devices at optimal speed, significantly saves charging time.