Fangrui Product Details Plug And Play With Any Usb Port, And The Input Terminal Is A Type-c Female Port, Perfectly Compatible With Type-c Port Chargers (pd). Any Usb Port Can Be Used As A Power Supply Device, Charging Head/power Bank/pc/notebook/router/nas, Etc. Designed For Voltage Regulation Of Small Usb-powered Devices, The Output Is A Usb-a Female Port Built-in Boost And Buck Circuit, The Output Can Be Turned Off, And The Voltage Is Easy To Adjust. Voltage Adjustment Range (2.5v-8v 0.5v) Operation Method: Turn The Knob Clockwise To Increase The Voltage, Counterclockwise To Decrease The Pressure, And Turn The Knob Fully Counterclockwise To Close. Product Name: Usb Voltage Regulating Module Input Voltage: 5v Output Voltage: 2.5v-8v0.5v Output Power: Upper Limit 7 Watts Input Port: Usb Type-c Female Port Output Port: Usb-a Female Port Colour:black Material:pla Package Contents: 1 X Usb Speed Controller 1 X Usb A To C Cable Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different