This is a GREAT idea!
Essentially, your phone will keep track of the last place you had your sunglasses so you never lose them! Here's the technical explanation...
"iBeacon chip in its sunglasses to alert you when you’ve accidentally left them behind. When your sunglasses are more than 16 feet away from your phone, you’ll get an alert, and then again at 32 feet and 50 feet. If you venture farther than that, the Tzukuri app will keep track of the last location it had for your sunglasses." (Yahoo)
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