Is a DC adjustable step up/down power supply ule 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 ule.Simple and efficient,practical. Features:Low power supply.Wide voltage output.Support boost and buck.Long handle potentiometer adjustment Using 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 +plastic Size:70*26*22mm Output Voltage:DC 1.0V-24.0V Output Power:3W(Max) Conversion efficiency:94% Working current:30mA Working Temperature range:-20 Celsius-85 Celsius Working Humidity range:0%-95%RH Package Contents: 1 * uleOnly the above package content, other products are not included. Note: Light shooting 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.