Controller: ATmega32u411
Frequency: 16 MHz
Working voltage: 5V
Digital IO port: 20
PWM channels: 7
Analog inputs: 12
5V digital / analog maximum allowable current: 40 mA
3.3V digital / analog maximum allowable current: 50 mA
Flash Memory: 32 KB (ATmega32u4) of which 4 KB used by bootloader
SRAM: 2.5 KB (ATmega32u4)
EEPROM: 1 KB (ATmega32u4)
The module has 6 buffers 7HC4050 on board, leading out serial UART, IIC, SPI, reset pin and button.
Small board size: 29.5mm * 21.3mm with MicroSD card slot (excluding memory card)

Package Included:
1 x ATMEGA32U4 Virtual Keyboard Module
1 x Pin header