The power supply is a high-efficiency Automatic voltage regulator. Whatever is the input voltage value, the output voltage can be maintained constant. For example,set the output to 12V, then the variation of the input voltage can be in the range of 5-32V, the output voltage will be maintained at 12V. This module has a perfect protection function, and can be widely used in notebook power, vehicle power supply, solar charge etc.. Advantages: The input uses replaceable fuse to protect power supply and equipment; The whole electrolysis use patch, low resistance, high frequency capacitor ,to make the ripple down to the freezing point; Constant voltage, constant current, under voltage protection (MPPT is more suitable for solar charging) The output has error indicating lamp,it will light when the output voltage drift too serious, short circuit and other fault; Inductor use iron silicon aluminum, 0.8 double winding, generate less heat. Far right one (close to output) is for Under voltage protection (VV) and it is mostly used for Solar Charging The device can monitor a DC-DC output voltage and quickly disconnect the power source from the DC-DC input load when an overvoltage condition occurs. A power-OK output signals when the DC-DC input voltage falls below an adjustable threshold. Center one is for Constant Current ( CC) A constant current is that does not change its intensity with time. Left one (near input terminal) is for Constant Voltage ( CV ) Keep the output voltage constant