Originally Posted by freecia

There are bluetooth trackers which can locate a device within bluetooth range and make a tone upon request via app. One of the well known ones is Tile and they recently updated their basic Tiles to accept a user-replaceable coin battery.

https://support.thetileapp.com/hc/en...oes-Tile-work-

Bluetooth trackers are likely good enough for the house, probably not suitable for luggage tracking due to range limitations. More on luggage trackers here: [Consolidated]: Luggage Tracking Solutions (was: Trakdot to help you track your...)