Does a cat life tracker exist?

I want to know if there is some kind of device I can put on/in my cat (a vet can do it if needed) that will tell me if my cat is still alive. As odd as that may sound my cat likes to go outside and play all night and sometimes days at a time. I live out in the country and he is free to come and go as he pleases I... show more I want to know if there is some kind of device I can put on/in my cat (a vet can do it if needed) that will tell me if my cat is still alive. As odd as that may sound my cat likes to go outside and play all night and sometimes days at a time. I live out in the country and he is free to come and go as he pleases I would just like to know that he is still alive sometimes.
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