I think there are issues. Radios need quite a lot of power, while batteries must be very light and compact to not bother the cat (otherwise a collar would be ev

I think there are issues. Radios need quite a lot of power, while batteries must be very light and compact to not bother the cat (otherwise a collar would be eventually removed - a cat will surely find a way to do so) I'm really surprised the cat in the article didn't tear off the collar on the first occasion.