A friend of mine has something like that. He has these little beeper thingies attached to all of his remotes, and there’s a central unit in the kitchen where you can press a button and the beeper thingie beeps on the corresponding remote. It’s quite brilliant.
Wow, I thought I had invented that. I have been telling my kids for years that they should put a button on the front of the TV (even my family couldn’t lose the whole TV) that you could push to make the remote beep…. louder and louder until you find it.