Bluetooth trackers on collars do not work the way people assume. There is no live map and no satellite in the sky watching your cat; the tag simply announces itself to passing iPhones, and each one quietly reports its position back. In a town that means a missing pet is usually located within an hour or two. On an empty hillside with nobody about, it means nothing at all, and it is better to know that before you rely on it.

Six styles are listed, and the practical points are the same across all of them. It pairs into Apple's Find My app alongside your other belongings, can raise a left-behind alert when you walk away without it, and tracking can be shared with up to six people, which is the feature that actually matters during a search because everyone can look at once rather than relying on one phone. It clips to a collar, keys or a bag equally well.

• Works with Apple's Find My network
• Left-behind alerts when you walk away without it
• Tracking shareable with up to six people
• Six style options
• Clips to a pet collar, keys or a bag
• Eleven photographs of the styles

One thing you need to know before ordering. Find My also requires an iPhone, with no Android equivalent.

Who it's for: iPhone owners with an escape artist in the house who want a realistic aid to finding them in a populated area, not a live tracking collar.