ITEM NAME:ATMEGA32U4 Beetle USB Development Board Module for R3 NEW Description: Microcontroller ATMEGA32U4 Clock Speed: 16 MHz Operating Voltage: 5V DC Digital I/O Pins: 10 PWM Channels: 4 Analog Input Channels: 5 UART 1; I2C 1; Micro USB 1 Flash Memory: 32 KB of which 4KB used by bootloader 2.5 KB; EEPROM 1 KB Size: 21 x 28 x 3mm Package Includes: 1 Piece ATMEGA32U4 USB Mini Development Board 3 Pieces Pin Header.UART 1; I2C 1; Micro USB 1. Analog Input Channels: 5. Clock Speed: 16 MHz. People always bought together with. 2.5 KB; EEPROM 1 KB.