I recently bought a Nokia Lumia Treasure Tag to assist me in finding my keys on the occasions I lose them.
The treasure tags came out in 2013, but I didn’t really pay them any attention. Between then and now, the Treasure Tag Windows Phone application has been deprecated (unavailable in the UK region was the error message – perhaps globally..?). Annoyingly, the apps for Android and iPhone are still unavailable.
However, after a little (a lot) of messing around with the phone (a Win 8.1 Lumia 640) the recently updated Gadgets application noticed that i’d paired with a Treasure Tag.