ITEM NAME:USB ATMEGA32U4 Development Board Module DC 5V for Description: Microcontroller: ATMEGA32U4 Clock Speed: 16MHz Operating Voltage: 5V DC Digital I/O Pins: 10 Flash Memory: 32 KB of which 4KB used by bootloader Specification: Material: Metal Clock Speed: 16MHz EEPROM: 1KB Size: Approx. 13*11*1 cm/5.12*4.33*0.39 inch Package Includes: 1 Piece USB ATMEGA32U4 Development Board.People always bought together with. Size: Approx. EEPROM: 1KB. Clock Speed: 16MHz.