Fangrui Product Details You Can Use A Jumper Cap To Select Vccio To Connect To A Voltage Of 5v Or 3.3v (vccio Can Be Used To Power The Vcc Pin Connected To The Board) Power Indicator:module Power Indicator Light For Easy Viewing Of Module Power Supply Status Interface:connect To The Interface Corresponding To The Microcontroller Ft245bl:usb Chip For Parallel Bidirectional Data Transmission Interface. Complete Usb Protocol Processing Chip - No Need For Specific Usb Firmware Programming Usb To , Mcu Communicates With Pc. Usb Interface: Provide Mini Usb Interface Vccio Power Supply Jumper Colour:as Shown Material:plastic Package Contents: 1 X Ft245 Module 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.