1. Use STM8S103F3P6 as the master IC. 2. You can use 2.54 pin on the board or supply pad, the pad when using supply, input voltage range 4.5V-15V, can output to the outside through pin 3.3V 3. leads to all pins, the pins to the pin marked the label, with a reset button, LED, and the program demonstrates LED, small but perfectly formed. 4. Support SWIM debug mode. Note: 5V pin's voltage is the input voltage of the module. Material: PC+Metal colour: As shown Package Contents: 5 x Development Board Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store