This product is retired, please consider our Blend Micro - an Arduino Development Board with BLE as your alternative choice. This is the tiniest Arduino yet! The Arduino Micro packs all of the power of the Arduino Leonardo in a 48mm x 18mm module (1.9" x 0.7"). The Arduino Micro is a microcontroller board based on the ATmega32u4 (datasheet), developed in conjunction with Adafruit. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHzcrystal oscillator, a micro USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard. The Micro is similar to the Arduino Leonardo in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behavior of the board; these are detailed on the getting started page from the Arduino Official Webstie. Specifications Dimensions: 1.9" x 0.7" / 48mm x 18mm Weight: 6.5g Microcontroller:ATmega32u4 Operating Voltage:5V Input Voltage (recommended) :7-12V Input Voltage (limits) :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) of which 4 KB used by bootloader SRAM:2.5 KB (ATmega32u4) EEPROM:1 KB (ATmega32u4) Clock Speed:16 MHz