SMAKN Buck and Boost Voltage converter voltmeter display 5-25V-RED Size:: 47x41x16 (length*width*height)(mm) Weight:;23g Display Color; Blue/Green/Red Input voltage:5.0-25.0V LED Indicator :YES ;Output voltage:0.5-25V(Adjustable); IN/OUT Power : 25W(MAX) Input current:Rated current MAX 2A Output current: Rated current MAX 2A S1 :Choose and remeber the work sate;OFF/ON: Control the output state Input and output voltage can display alternately The starting state can be set freely. This modlue has the function of controling the start-up and shutdown by the button. So it can control easily the state of output ;This module have the big power MOS to protect the circuite in case of connecting reversely. This can improve the effiency and reliablity.