Before the first use, solder a 220Ω, 3W resistor to the module output and make sure that the potentiometer is not in either extreme position, connect 3V DC voltage to its input, set the desired output voltage, solder the resistor, and only then connect a consumer to the module.
The useful range of the potentiometer is approx. 10%, so avoid fast rotation when adjusting, the output may remain unchanged for a long time, then suddenly increase.
Do not set the module output voltage below its input voltage, because the module will be destroyed.
There is a grounding around the Vout and Vin terminals, so avoid directly pinching the crocodile clip to the PCB, because it may cause a short circuit.

Multi-turn potentiometer for precise adjustment
Maximum output peak current: 2A
Input voltage: 3...12V DC
Maximum output voltage: 4...28V DC
Efficiency: max. 97%