[Upgrade] Low cost and high stability, it can replace the basic program of STM32F103C6T6 chip. (If your program flash is less than 32K, RAM is less than 10K, and Timer 4 and Serial 3 are not used, you can use it instead) ST-Link V2 Programmer: supports a full range of STM32 SWD debugging interfaces, simple 4-wire interface (including power supply), fast and stable; interface definition shell directly marked 40pin STM32F103C6T6 minimum system board: Micro-USB connector, which can power the board and communicate with USB. Added 5V power output, and the output I/O port is protected, for fear of operation errors caused by damage to ST-LINK V2 Colour:Random Color, don't accept the specified color Material:Plastic + Metal Package Contents: 3 x STM32F103C6T6 development board (unwelded pin header) 3 x ST-Link V2 downloader (random color, don't accept the specified color) 3 x DuPont line (random color, don't accept the specified color)