It's an Arduino Leonardo clone on a 2.something mm thick PCB. It has a power LED and a conventional Arduino LED on pin 13. The most interesting thing is that it can be reprogrammed to act as an HID (Human Interface Device). This has long been a property of the Arduino Leonardo (Atmel MEGA32U4), but isn't quite so interesting until you put it on a USB key. The aim of this project is to create a device which will type random silly things into the computers of my friends when they're not looking.
