OOPSDOGGY Leather AirTag Cat Collar with Bell - Non Breakaway Kitten Collar with Apple Air Tag Holder - Lightweight GPS Pet Collars for Girl Boy Cats, Small Dogs, Puppies (Blue)

Collars - I use these with Apple AirTags: https://www.amazon.com.au/dp/B0CP2X8JG7 The AirTags seem to have the best network and tracking, which is what you're going to want when you need to actually use them.