I just saw a morning news report on this tech/relationship company called One Key Away.
Here’s the twist. You answer a series of questions online and then show up for a mixer where you are given a small gadget with a series of lights to wear around your neck. When you approach another mixer attendee, both of your gadgets present a color: Red means there will be challenges if you date, yellow means you both share a typical match and green means you could be in business.
I am assuming that if no one is in range of your device the lights turn off and one of two things happens. If you are a woman, the gadget sets itself to vibrate. If you are a dude, the device can suddenly be used to control the televsion behind the bar.