This is an Ard based ATmega32u4 microcontroller board.It has 20 digital input/output pins (7 can be used as PWM output and 12 analog inputs), 16 MHz crystal oscillator, -USB connection, power , ICSP header and reset button.Contains everything needed to support the microcontroller; simply connect it to a computer and a USB cable or power with an AC-to-DC adapter or battery to started.The ATmega32u4's built-in USB communication eliminates the need for a second processor.Easy to install and use.Specification:Microcontroller: ATmega32u4Working voltage: 5vInput voltage (recommended): 7-12VInput voltage (range): 6-20VDigital I/O pins: 20PWM channels: 7Analog input channels: 12DC current/I/O pins: 40 mADC current to 3.3V pin: 50 mAFlash: 32 KB (ATmega32u4) 4 KB used by bootloaderSRAM: 2.5 KB (ATmega32u4)eepm: 1KB (ATmega32u4)Clock Speed: 16 MHzSize: 68.6 x 53.3mmMaterial: PCBcolour: bluePackage Contents:1 x Development BoardOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.