I got a newish RF cat tracker lately and really like it: https://tabcat.com/ https://tabcat.com/ It's not app or Bluetooth based (has an included detector) and

I got a newish RF cat tracker lately and really like it: https://tabcat.com/ https://tabcat.com/ It's not app or Bluetooth based (has an included detector) and it works pretty well. Battery is supposed to last a few months. It easily fits on a cat collar and doesn't bother mine at all. I've been looking for something like this for years and someone finally made one!