I bought a four-pack of Tiles and I keep one in the car, one on my key ring, one in my bowling bag, and one on my bicycle. I got them because when I parked and locked the car at the base exchange I couldn't find the keys when I came out. After checking with the store and spending about 30 minutes retracing my route in the store I had to walk to my condo, about a mile away. My house keys were on the key ring but my unit was being heat treated for bed bugs and they pest control people let me retrieve my valet key. I called AAA on my cellphone and got them to open the car and I drove to the motel I was staying because it was too hot inside my condo to stay. While emptying my pockets, I found my keys in my back pocket. I must have had them in my hand with my wallet when I locked the car and accidentally dropped the key with wallet in the back pocket.
Now with the Tile, if I lose my key I can use the Tile app to find them or to send a signal for the Tile on the key to chirp. I haven't had to use it yet but it's a relief to know it's there.