Fangrui Product Details The Power Supply Module Display With Voltage, Usb Adjustable Buck Boost Power Supply Module 3.5-12v To 1-24v. Plug In Usb Or Micro-usb Can Easily Output Adjustable Voltage From 1v To 24v And The Power Is 3w. One Key To Turn Off The Output, And Store The State Before Power Off, No Worry About Data Loss. [adjustable Voltage]: Adopt Multi-turn Precision Adjustable Potentiometer To Adjust Voltage. [data Storage]: Automatically Save The State Before The Power Failure, The Output Data Will Not Be Lost. Material: Pcb Colour: As Shown Package Contents: 6 X Voltage Regulator Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection 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.