1. Open the design circuit diagram development software interface for free download, 2. You can also modify it according to your needs, and the download program is simple and convenient. 3. You can simply use sensors and connect various electronic components (such as: LED lights, buzzers, buttons, photoresistors, etc.) to make a of interesting works. 4. Using a high-speed microprocessor controller (), the development operation interface and environment are very simple and easy to understand, which is very suitable for beginners to learn. Product Description: Digital I/O digital input/output terminals 0~13 in total. Analog I/O Analog input/output terminals 0~5 in total. Support ISP download function. Input voltage: No external power supply is required when connected to the computer USB, and the external power supply is 5V~9V input. Output voltage: 5V output and 3.3V output. Using microprocessor controller Processor Speed: Normal Supply Current: Normal Power supply voltage: 9-12v Power: regular size: 10.5 x 5.3cm Material: Plastic colour: blue Package Contents: 1 x Development board 1 x Mini cable 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.