The power supply unit offers universal power supply for portable devices. An LED on the upper side of the device shows the operating status and a rotary switch on the back side allows for changing the voltage in a range from 3 V to 12 V. The output voltage is stabilised and thanks to the built-in fuse, the device is automatically siwtched off in case of overheating. For individual use of the power supply unit, a 2 m connection cable with 9 different connectors is included.