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Chipolo just announced the Chipolo Card for wallets, calling it the “world’s thinnest Bluetooth tracker.” A bold claim considering the TrackR Wallet 2.0, announced in January, is 0.15-mm thinner. Not that it really matters since neither device is shipping yet.

For the most part, Bluetooth trackers from companies like Chipolo, TrackR, Tile, and others have become so small that they’re pretty much attach-and-forget. Trackers on lost items emit an audible alarm from their on-board speakers when within range (100-200 feet, or less with obstacles) of your iPhone or Android phone. Otherwise, you’ll receive a location alert whenever someone in your tracker’s network wanders within range of your tagged item. Trackers work really well when…

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