Description: Using a High-Speed Microprocessor Controller (ATMEGA328) Support ISP download function Input voltage: No need for external power supply when connected to computer USB, external power supply 5V~9V DC voltage input. Output voltage: 5V DC voltage output and 3.3V DC voltage output. Completely resolved the incompatibility and instability of traditional UNO boards on win7 and win8 systems Increased pin sockets for everyone to use the DuPont line Specification: Material: PCB panel Size: 70*50*12mm/2.76*1.97*0.47'' Package Includes: 1Pcs accessories 1Pcs Development Board 1Pcs USB cable