Red-Hot Pepper Detector
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In The Super Mario Bros. Super Show! episode "Love 'Em and Leave 'Em", it is Mario's Red-Hot Pepper Detector that alerts him that a large patch of hot peppers is nearby; the contraption also leads Mario, Luigi, Princess Toadstool and Toad to that hot pepper patch.
Where Mario obtained the Red-Hot Pepper Detector is never explained, how the device works is never told either; though it seems that if any hot peppers are nearby, the Red-Hot Pepper Detector will begin to vibrate and beep, alerting anyone nearby to the fact that it senses something.