. Features: Small form-factor development board for ATMEGA32U4 microcontroller (Compatible with Leonardo R3). The ATmega32u4 microcontroller has an USB interface without the need for a Serial UART-to-USB adapter. A fantastic feature of this board is that it plugs right into the USB port of your computer, without the need of a cable, so it"s ready to program and run your code without the need of additional components or accessories. Operating Voltage 5V DC,Clock Speed 16 MHz,PWM Channels 4, Analog Input Channels 5,Digital I/O Pins 10. UART 1,I2C 1,Micro USB 1,Flash Memory 32 KB of which 4KB used by bootloader,SRAM 2.5 KB,EEPROM 1 KB Specifications: Microcontroller:ATmega32u4 Clock Speed: 16 MHz Working Voltage: 5V DC PWM Channels : 4 Clock Speed : 16MHz Digital I/O Pins : 10 Analog Input Channels : 5 I2C : 1 UART : 1 SRAM : 2.5KB Micro USB : 1 Size :approx 41.93x16.27x8.12mm/ 1.65x 0.64x0.32in (15g) Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package Includes: 1 PC x Virtual keyboard Badusb Leonardo R3 USB When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it