The simple answer is battery life.
My requirements for a cat tracker are:
- Very long battery life (around 3 months). I don’t want to be changing batteries all the time. The one day I forget to change the battery will be the day when Buttons decides to go an investigate next door’s shed, I know it.
- GPS-level accuracy.
- The ability to remotely find out where your cat currently is, allowing you to find him if he’s lost.
- Small enough and light enough for a cat to carry around (obviously!).