CONVERTS AC TO DC: The switching DC power supply features AC-DC converter variable linear / regulated design. Provides reliable AC-to-DC power conversion w/ constant source of DC voltage. Works w/ cellular phones, CB radio, scanner, HAM radio, etc USB AND SCREW-TYPE TERMINALS: This workbench variable power converter features USB charge port and universal screw connection terminals compatible w/ a wide range of device/equipment. Used to test device/equipment 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. Switch-activated power control eliminates the need for an external battery or additional power source SHORT-CIRCUIT PROTECTION: This PSU is equipped w/ built-in electronic overload and short circuit protection to ensure the safety of the operator and any connected electronics. Has rugged and durable housing construction safe desktop placement CIGARETTE LIGHTER