Is a DC adjustable step up/down power supply module with LED digital tube display.Display output voltage in real time.Rotate potentiometer to adjust output voltage.Set output voltage to meet the require.It can be used as ordinary buck power supply module.Simple and efficient,practical.Features:Low power supply.Wide voltage output.Support boost and buck.Long handle potentiometer adjustmentUsing Steps:Input DC 5V from USB male socket;Adjust output voltage by potentiometer to meet require;Remove input voltage;Connect load at output terminal;Re-connect power ON and enjoy using.color:blue Material:metal +plasticSize:70*26*22mmOutput Voltage:DC 1.0V-24.0VOutput Power:3W(Max)Conversion efficiency:94%Working current:30mAWorking Temperature range:-20 Celsius-85 CelsiusWorking Humidity range:0%-95%RHPackage Contents:1 * ModuleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.