Last month, the folks at Tile released the Tile Mate, the thinner and lighter successor to the now-discontinued 2nd-gen Tile Bluetooth tracker.

If you're unfamiliar with Tile, it's like "Find My iPhone" but for your stuff. You attach the little square gadget to your key ring, connect it to your phone via Bluetooth, and then it works like this:

1. If you can't find whatever the Tile's attached to, use their companion app to locate the device (as long as its within Bluetooth range) or view its last-known location on a map. When you're within range, the app can "ring" the Tile so it plays a chime until you've tracked it down.
2. If you can't find your phone but have your Tile on hand, press its button and your phone will ring, even on silent.
3. If you mark an out-of-range Tile as lost using the app's "Notify When Found" feature, everyone else who has the app installed can anonymously help you find it. If they come into range with your Tile, you get pinged about its location and they get notified that they helped someone find their stuff. Pretty awesome, and this will only get more powerful as more people get on board with Tile.

Their promo video sums it all up nicely:

https://youtu.be/dxyajtakhPg

Get a single Tile Mate for $25 on Amazon. You can also pick up a 4-pack for $70 or an 8-pack for $119.