CONVERTS AC TO DC: The Pyramid Bench Power Supply features a linear/regulated design. Provides convenient and reliable AC-to-DC power conversion (12V DC) w/ constant source of DC voltage. Works w/ cellular phones, CB radio, scanner, HAM radio, etc SCREW-TYPE TERMINALS: The features universal hardwired screw-type connection terminals that ensure compatibility with a wide range of devices, equipment, and components. That is used for component and device equipment testing, operation, and performance PLUG-IN OPERATION: The simple plug-in operation provides a constant source of DC voltage, allowing for quick and consistent power conversion. This Switch-activated power control eliminates the need for an external battery or additional power sources SHORT-CIRCUIT PROTECTION: Equipped with/ built-in electronic overload & short circuit protection to ensure the safety of the operator & any connected electrical device. Also, fuse protected w/ auto reset. Perfectly safe for tabletop or desktop