Tiles are small tags you can attach to your keys, remote control, wallet, handbag etc in order to locate them if you can’t find them. I have always wished for something like this as I tend to forget where I left the remote or my keys/travel card. I am very easily distracted and tend to plonk things down and then cover them with stuff so that I cannot find them when I just have to be out the door super fast!
The only place I can think of where this wouldn’t work is that you tend to lose your phone! Two downsides I can see is that the batteries only last a year after which you have to replace them, and they are quite pricey. Cheaper versions will probably appear soon though.