HI all
This is a voltage adjuster from input up to 40 volts down to 3.3 to12 volts rated at 3Amps.
It’s a LM2596 unit 45Hx 25Wx 15H mm.
The dearer unit has an LED readout which would be larger.
I have setup a few of these units for LED lights and as a speed control for radar.
As per usually from China but cheap !!!
Harry