LM2596 Voltage regulator step-down buck converter module 4-40V in 1-35V out
Buck (step-down) converter. You need small flat screwdriver. when the first led light, it showsinput, the second led showsoutput. 4V-40V input 1.3V-35V output. Output Current Max:2A. Press the key "S1" switch on/off the display.