i noticed this on a website and thought i'd share it with you .
https://www.thetrackr.com/bravo/?utm_source=bing&utm_medium=Bravo_Search_GeneralKeywords_cpc&utm_campaign=Bravo_Search_GeneralKeywords
if you have ever lost your keys,phone,wallet, etc, this looks like a really good invention.
I think these are better than others I've seen purely for their size if nothing else.