DROK 180057 LM2596 Analog Control Buck Converter DC-DC 4-32V to 1.25-30V Step-down Regulator Module 24V 12V to 5V 3A Power Inverter Volt Stabilizer with Red LED Display Analog Control: adjust the screw on top of the potentiometer clockwise or counterclockwise to increase or decrease the output voltage. Has very stable output, the output range is DC 1.25~30.0V, please note the input voltage should be higher than output voltage at least 2V. Press the MODE switch, the display will cycle through the output voltage, output current and input voltage. The output voltage can be turned on/off by the ON/OFF switch, when the output is off, the digital tube will display OFF. With reversed polarity protection and short circuit protection, more safe to use; the display is very accurate.