CONVERTS AC TO DC: the bench DC power supply features ac-dc converter variable linear/ regulated design. Provides reliable AC-to-DC Power conversion with a constant source of DC voltage. Works with cellular phones, CB radio, scanner, ham radio, etc DUAL USB PORTS: This workbench variable power converter features two (2) USB charge ports and universal banana Plug connection terminals compatible with a wide range of devices/equipment. Used to test device/equipment operation and performance 7 AMP: the simple plug-in operation provides a constant source of DC voltage, allowing for quick and consistent power conversion. Constant Amperage is up to 7 amp with 4.5Amp continuous, power output of 13.8V DC, and 120 volt power supply SHORT-CIRCUIT PROTECTION: This is equipped with/ built-in electronic overload and short circuit protection to ensure the safety of the operator and any connected electronics. It has rugged and durable housing construction & cabinet Heatsink CIGARETTE LIGHTER: This desktop bench power supply is equipped with a cigarette lighter, and a power socket adapter to provide power to portable devices. Switch-activated power control eliminates the need for an external battery or additional power source