Pyramid Heavy-Duty PSV-300 Switching DC Power Supply is designed to use AC power-to-power equipment that requires 13.8V DC automotive power. If you are an electronic hobbyist or technician, you will appreciate the many uses for the power supply at your workbench or in your house. For example, use your CB mobile transceiver as a bass station, check theoperation of auto sound systems before you install them in your vehicle, or evenpower marine equipment such as pumps. Regulated Output Voltage-Makes it safe to use with mobile CBs, Ham radios, CD players, tape players or anything you would power with a vehicle's DC electrical system.