Phantom Keystroker from ThinkGeek
121https://www.thinkgeek.com/product/jknk/?cpg=yt
-Phantom Keystroker
-A ThinkGeek creation & exclusive
-Looks like an innocent little flash drive
-Matte black
-Victim's computer must have a USB port, but it'll work on any OS
-Switches allow you to choose among it turning Caps Lock on and off, typing random characters on the keyboard, and moving the mouse or ALL THREE
-Also set the time delay on a sliding scale between annoying "events"
-Other things the random typing setting produces: the phrase "I see what you are doing" and Pi to a bunch of digits
-The name is printed on the side (subtly) so that if someone overreacts, you can quickly point out that it's a prank product
-Dimensions: 2 1/2" long x 3/4" wide x 1/4" thick
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