Converts AC to DC: the Pyramid Bench power supply features 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 Plug-in operation: The simple plug-in operation provides a constant source of DC voltage, allowing for quick and consistent power conversion. Switch-activated power control eliminates the need of an external battery or additional power source Screw-type terminals: features universal hardwired screw-type connection terminals that ensure compatibility with a wide range of devices, equipment's and components. Used for component and device equipment testing, operation and performance Short-circuit protection: equipped w/ built-in electronic overload and short circuit protection to ensure safety of the operator and any connected electrical devices. Also fuse protected w/ Auto reset. Perfectly safe for tabletop or desktop placement Built