Features: Opening original schematic design, free development software interface download, also allow your needs to be modified, easy and convenient to download the program. Can simply use sensors, all kinds of electronic components connection (such as LED lights, buzzer, buttons and photosensitive resistance, etc.), make all sorts of interesting work. Using high-speed microprocessor controller (ATMEGA328), development interface and environment are all very simple, easy to understand, very suitable for beginners to learn. Digital I / O: 0 - 13; Analog I / O: 0 - 5; Support ISP download function; Input voltage: DC 5V ~ 9V (No external power supply when connected to the computer); Output voltage: DC 5V / 3.3V; Using Atmega328 microprocessor controller; Package included: 1 x Development Board; 1 x USB cable; Note: This version can not compatible with OS system.