With 4 USB ports the box Car Smart is capable of charging 4 USB powered devices when on the move. All the USB ports feature an intelligent charge circuit that automatically regulates the power to the correct level for your device guaranteeing a safe and efficient charge (1A-2.4A). The charge circuit also allows the charger to be used in both commercial and domestic vehicles - even boats; An extra long (1.5m) cable allows the charger to be used both in the front of the car and rear - perfect for the back seat drivers; A rubberised surface protects the car dashboard and interior. Compatible with all USB devices handsets. Cable length 0.3m.