Welcome to our shop! Here are the key features of our product: 1. GOOD PERFORMANCE: Our 40 Pin STM32F103C8T6 minimum system board module is meticulously processed to ensure stable and reliable performance with minimal interference. 2. CIRCUIT DESIGN: The board is equipped with essential circuits based on the microcontroller, including a crystal oscillator circuit, USB interface, and USB power management circuit. 3. USB INTERFACE: Our module features a Micro USB interface, which is widely used in current smartphones. It allows for easy USB communication and power supply. 4. SWD INTERFACE: The SWD debugging interface enables convenient downloading. It requires a minimum of 3 wires to complete the debugging and downloading tasks. 5. 5PCS MODULES: This package includes 5pcs of the minimum system board module, providing you with ample quantity for various DIY electrical testing. It offers strong practicality. Material: ABS 100% Satisfaction: Our customers are our top priority. If you encounter any issues with the product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with satisfactory after-sales service. Thank you for choosing our product! Please note that the description provided above is in English. Make sure to communicate clearly and effectively with your customers.