Item Type: AC to DC Power Supply Material: Cold rolled steel Output Voltage: Fixed 13.8VDC/adjustable 7.5V-15.8V Output Voltage Regulation: Less than 2% Protection: Short circuit automatic protection (maximum limit 30A) Output Current: 30A (maximum), 20A (continuous) Fuse: 5A Meter Display: Color screen voltage/ammeter Width: Approx. 155mm/6.1in Height: Approx. 70mm/2.76in Length: Approx. 205mm/8.07in Uses: Vehicle radios and marine radios with transmit power below 100W 1Adjustable Voltage: Fixed output 13.8V DC, when the adjustment switch is toggled, the adjustable power output range is 7.5V?15.8V. 2Safe Protection: Maximum output current 30A, continuous current 20A, with 5A fuse, short circuit automatic protection function. 3Digital Display: Color screen display, clearly display voltage and current, is a high efficiency, compact, high performance switching power supply. 4Good Heat Dissipation: The AC to DC power supply has a built?in intelligent cooling fan, which automatically turns on when the internal temperature is higher than 50C. 5Wide Application: AC to DC switch transformer is suitable for car radios and marine radios with transmit power below 100W.1. Make sure that the corresponding positive and negative poles are connected to the device, and use the correct terminal to connect the cord. 2. When the power supply device is plugged into a wall outlet, the power must be turned off first, and the device is in the off state. 3. The equipment must be placed in a dry and well ventilated place. 1 xAC to DC Power Supply 1 x Power Cord 1 x Manual