The Mobilize Car Charger Dual USB is a durable charger and has two USB connections. This gives you the option to charge multiple devices at the same time. The Dual Car Charger comes with a Micro USB cable of approximately 1 meter. You can also use your own USB cable to charge a tablet, navigation system or other smartphone, for example. By simply plugging a cable into both USB ports and then connecting it to the desired devices, it starts charging automatically. The 2 ports together have a maximum output of 2.4A. During charging, a ring will light up to indicate that the charger is in use.