Cold weather is an especially rough time for keeping track of one’s keys — so many more layers with so many more pockets — really, they could be anywhere. Stick a Bluetooth tracker on your keyring and suddenly finding items is as easy as tapping a button in an app. Of course, these trackers are good for bags, luggage, wallets and even jackets themselves. And if something goes missing out in the city, an anonymous finding network can help lead you to your lost item. We tested out most of the major tracker brands out there, comparing their everyday utility, compatibility, the size of the connected networks and other
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