The Innergie Duo USB Auto Adapter is an ultra-fast, dual USB auto charger featuring a powerful 21 Watt capacity. With two USB ports, each generating 2.1 Amps output, the Duo USB Auto Adapter is capable of charging two tablets, smartphones, or other mobile devices at the same time at full charging potential, reducing charging times. Superior power and performance and compact, lightweight design, makes the Duo USB Auto Adapter the ideal charging solution when you are on the road.