Fangrui Product Details 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 Variety 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 Dc Voltage Input. Output Voltage: 5v Dc Voltage Output And 3.3v Dc Voltage Output. Using Microprocessor Controller Processor Speed: Normal Supply Current: Normal Power Supply