This Dual USB Compact Device Charger from Axxess Mobility plugs into a vehicle s 12-volt accessory port/cigarette-lighter charging port. The LED indicator lets you know it s receiving power. The device has two USB charging ports-one 1 amp (perfect for charging a phone) and one 2.1 amp (for tablets). Only one device can be charged at a time. It works with all devices that use a USB charging cable (not included).