My cat goes out pretty often and it worries me when she doesn't come back until it's late, so I'm thinking of making her wear a tiny GPS on her collar. Do you think it's safe for animals to wear that kind of technology? I looked them up on the internet and only found ones made in foreign countries. If there are any products you recommend, please let me know. Also, could you tell me the difference between GPS devices and microchips? Which one should I get?