This Lind DC-DC Power Adapter provides a regulated DC output to power laptops and peripherals from a DC voltage source. Electrical isolation between input and output prevents ground loops and allows the output to be used as a negative voltage if required. The rugged design of Lind laptop power adapters make them ideally suited for use in harsh mobile environments. The adapter electronics is protected by a rugged Aluminum housing which is filled and sealed with epoxy that protects the electronics from damage due to shock, vibration and spilled liquids. Lind Electronics PA1555I-2194 DC Converter is one of many Chargers & Adapters available through Office Depot. Made by Lind.