The Samsung Sentry Gun, intended to guard demilitarised zones in Korea (presumably to replace the mines, etc):
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[*:x7njfk7e]Armed with a 5.5-millimeter K3 machine gun
[*:x7njfk7e]Two cameras: one for day-time and one for infrared night vision
[*:x7njfk7e]Can track and identify targets from up to 2.5 miles away in the daytime and about half that distance at night
[*:x7njfk7e]Microphone and speaker system to exchange passwords with human soldiers
[*:x7njfk7e]Capable of picking out a human target and can accurately track/shoot him or her in the heart[/list]http://%7boption%7d
Makes TF2 Engineer's sentries look a bit mediocre. 
Ought to be hitting the market about now if it hasn't already based on the dates, too.
All they need to do is put it on one of these:
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