GOXT 10681 Dual USB Charging Block (2.1-Amp High Speed and 1.0-Amp) Dual port high speed USB charger is perfect for keeping your smartphone or tablet charged on the go USB port charger outputs 5VDC up to 3.1 amps for quick charging Designed with two USB ports to charge multiple devices at once Plug into 12V receptacle for immediate installation Converts your cigarette lighter to a USB charging port