From the Super Mario Wiki, the Mario encyclopedia
The Treasure Alert is an accessory found in Paper Mario: The Origami King. It resembles a small handbell, painted gold with a chocolate brown handle, and emblazoned with an icon of a treasure chest. Mario can purchase this accessory from the shop in Breezy Tunnel, and when equipped, it will automatically ring when he is in the general vicinity of one of the game's many treasures.
Unlike other Alert-type accessories, the Treasure Alert does not have an equivalent device built at the Sensor Lab.
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