Interesting idea but the rather large tracker requiring a custom wallet is a bit of a deal killer. It's not credit card sized, it's much thicker. I suppose if

Interesting idea but the rather large tracker requiring a custom wallet is a bit of a deal killer. It's not credit card sized, it's much thicker. I suppose if you have a problem losing your wallet you may be willing to use this but since I've never lost mine or had it stolen it's not worth it to me.