The LEONARDO is an integrated USB HID board. Ideal for projects requiring the board to behave (act) as a USB human interface devices (keyboard, mouse, etc...). The LEONARDO is a microcontroller board based on the ATmega32U4. It has 23 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started (USB cable and power supply are not included). Feature: - Microcontroller: ATmega32U4 (16MHz) - Input voltage: DC 7V~12V - Regulator type (5V): LDO (linear) - Output current: 5V=1A, 3.3V=800mA - I/O: 23 - PWM: 7 - Analog inputs: 12 - USB connector: USB-B Product official page: http://robotdyn.com/catalog/boards/leonardo_r3_atmega32u4/ * For get a detail information of product, instruction, schematic diagram, dimension diagram, guide and software, Pls visit to official page of product. RobotDyn(R) - registered trademark in USA. Zhuhai RobotDyn Technology Co.,Ltd - Developer and manufacture.