The slick Smart System gun from Armatix looks like something James Bond might carry and uses watch that transmits an identifying radio frequency that prevents everyone but its wearer from firing.
The gun is one of several competing for a $1 million prize from the Smart Tech Challenges Foundation, a group started by tech investors in response to the shooting at Sandy Hook Elementary, where 26 were killed in 2012.

Man with the golden wristwatch: This James Bond-like gun may only be fired by a person wearing a radio signal emitting wristwatch

Red means stop: A light on the futurist gun indicates whether its been unlocked by the watch. Red means the gun is useless
The Smart System's futuristic appearance hides its simple logic: wear the watch and you can fire the gun. Don't wear the watch and the pistol is a useless hunk of metal.
A light on the gun glows green when it can be fired and red when it's locked.
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