I was looking at this product a kind of electronic tags that you can place on your mobile or keys so that you will always find them.
The Serenity consists of three boxes about the size of a book of matches. The slightly larger one is the basestation and the others - called tags - are to be attached to something you are likely to forget. If either of the tags gets more than 5m from the basestation then bleeping commences and you know to go back and get something you forgot - as long as the thing you forgot wasn't the basestation.
I always lose keys and my mobile among other things, so something like that would be useful for me but I normally phone my own mobile to trace it (provided I remember where the landline phone is) and I don't think I will not lose this objects and tags instead. I need something more drastic, sort of embedded 
