If you're constantly misplacing your keys, wallet, pets, etc., Tile can help you find them. Each Tile transmits a Bluetooth signal for a year or more without charging, allowing your phone to trigger an audible alarm and tell you when you're getting warmer or colder.
Note that these don't have GPS; they're really meant for finding things in your home, but $20 seems like a reasonable price for a year of never losing my keys. [Tile for iOS and Android - For Finding Anything and Everything, $20]
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