Gamber-Johnson 7300-0470, Laptop, Indoor, 12 - 32 V, 20 V, 3.5 A, DELLPower your computer The adapter is designed to power your computer and charge its internal battery from a DC power source. The adapter supplies current and voltage levels as required by the tablet. The rugged design of the Lind power adapter makes them ideally suited for use in harsh mobile environments. The adapters electronics are protected by a rugged aluminum housing which is filled and sealed with epoxy that protects the electronics from damage