CHARGING FOR BOTH FRONT & BACK SEATS : The Road Trip 4-Port Car Charger is the perfect on the go charger for families or those traveling in groups. There are 4 2.4A USB ports(for 9.6A total), two in the front and then attached by a 6 foot cable, there are two more USB ports to provide charging for any passengers in the back seat.  INTELLIGENT CHARGING USB PORTS AND OVER-CURRENT PROTECTION :  The Road Trip features built-in smart technology  for automatic device and maximum current detection for each specific device. It also includes a smart circuit and over-current protection to prevent power surges and short circuiting.  CHARGING FROM YOUR CAR OUTLET : Use any 12-24 volt auxiliary power socket or cigarette lighter to power this Road Trip 4-port charging system which is the standard in most vehicles. This charging system can simultaneously charge 4 different items at one time. BACKSEAT PORTS ATTACH IN MULTIPLE WAYS : The backseat secondary ports can can be easily attached to either a seatback pocket with a clip or can be mounted to a headrest post with the included headrest post mount.  The seat pocket clip comes pre-installed on the power hub but can be easily switched out for the headrest post mount. WHAT IS INCLUDED : The Road Trip 4-port car charger, operating instructions, and a 2 year limited warranty.