Description: Compared to other versions of the using a separate USB-Serial converter chip, the Leonardo innovatively uses a single-chip solution. Only with a Atmega32u4 USB communication and control. The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo 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. Greatly improve the applications. Leonardo need the new version above IDE1.01. Specification: Microcontroller: ATmega32u4.  Operating voltage: 5V.  Input voltage(recommended): 7V - 12V.  Input voltage(limits): 6V - 20V.  Digital I / O pins: 20.  PWM channels: 7.  Analog input channels: 12.  DC current per I / O pin: 40mA.  DC current for 3.3V pin: 50mA.  Flash memory: 32KB(ATmega32u4) of which 4KB used by bootloader.  SRAM: 2.5KB(ATmega32u4).  EEPROM: 1KB(ATmega32u4).  Clock speed: 16MHz.  Package included: 5 x compatible Leonardo R3.  5 x USB cable