This is an Ard-based ATmega32u4 microcontroller board featuring 20 digital input/output pins (7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a -USB connection, an ICSP header, and a reset button. It includes everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. The ATmega32u4's -in USB communication eliminates the need for a secondary processor. Easy to install and use. Specification: Microcontroller: ATmega32u4 Operating Voltage: 5v Input Voltage (recommended): 7-12V Input Voltage (range): 6-20V Digital I/O Pins: 20 PWM Channels: 7 Analog Input Channels: 12 DC Current per I/O Pin: 40 mA DC Current for 3.3V Pin: 50 mA Flash Memory: 32 KB (ATmega32u4) 4 KB used by bootloader SRAM: 2.5 KB (ATmega32u4) EEPROM: 1KB (ATmega32u4) Clock Speed: 16 MHz Size: 68.6 x 53.3 mm Material: PCB Color: Blue Package Contents: 1 x Development Board Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.