1. This product is a 32-bit microcontroller based on the -M3 , providing high operating frequency and powerful performance. 2. The main frequency of the chip used is as high as 72MHz, and it has very rich on-chip resources, which can fully meet the needs of STM32 learning. 3. The built-in flash memory integrates Flash memory for storing code and programs, with excellent performance, abundant resources, and ultra-high cost-effectiveness. 4. Multiple GPIOs with multiple universal input or output pins (GPIOs) for connecting external devices. 5. It has a wide range of applications, including but not limited to industrial automation, automotive electronics, household appliances, medical equipment, smart homes, and embedded systems. Specification:A: STM32F103C8T6: Main control chip: STM32F103C8T6 Input voltage: USB 5V Output voltage: 3.3V or 5V 3V3 or 5V maximum power supply current: 500MA Timer: 4 Serial port: 3 USB function: 1 [KB]:20KBytes Flash[KB]:64KBytes Download method: SWD, serial port download Suggestion: CH32F103C8T6 belongs to the enhanced F103C8T8, with built-in USB download function, no need for additional downloaders, excellent performance, abundant resources, and ultra-high cost-effectiveness. Colour:Black Material:PC Package Contents: 1 x Development Board(Due to different product batches, the appearance , which does not affect the use) 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.