How easy to snoop?

This is the 'Key catcher'

This is a device that can be connected to a keyboard to record all keystrokes. It has a changeable password, keyword search, enable/disable option, and stores URLs. Records 262,000 keystrokes and does not require any software. I find it alarming how quick someone can hook this up to a keyboard and have total access to any password you type into a computer. Everyone is afraid of over the net security threats, but devices like these make hacking even easier.