This is a Panic Button. I got it for $7.50.
I wonder what happens when someone pushes it?
This USB button came with some really lame software for windows, so I set out to find out how to use it in linux.
After a bit of googling, I found it requires that you install the perl library Device::USB::PanicButton from the cpan repository. Next you have to write a script to make it do something interesting. And finally you have to give the button a good whack.
Here is a video of me using my panic button:
Heres the files: