This keychain has Tile tracking built-in so you'll never lose your keys

Love mine, but never use the Tile stuff. I just found it unreliable, with false positives and false negatives.

And just not necessary. The basic trick of turning your keys into a swiss knife means they don’t jangle, aren’t tangled up in other things in your pocket as you extract them, and don’t gradually saw their way through your pocket material. So I pop it back in my pocket before the door’s even open. Never would have used the Tile thingy if I’d set it up.

The USB battery also runs a tiny light for seeing the lock, but is powerful enough to find the stuff that you just kicked under the couch.