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To my knowledge, Tiles—small Bluetooth Low-Energy (BLE) devices that can be attached to car keys, wallets and other items so they can be located if misplaced—are not read-write-capable. You would simply associate an item, such as your keys, with a specific Tile in the Tile app, then use the app to determine the last known location of the Tile, and thus your keys. You could also use the app to make the Tile chirp so you can locate it.
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