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The Jack-O-Lert is a product created by Wayne Security which alerts citizens that Jack O'Lantern is in the area. It is a wrist-mounted device that uses advanced chemoreceptors to pick up on Jack-O-Lantern’s unique smell profile and comes in sangria. Bruce Wayne was so impressed with the Jack-O-Lert that he immediately put it into beta testing and decided to keep open Wayne Security. Later as Batman, he created a repurposed version that focuses on tracking the Joker’s unique smell profile in midnight black. Batman was able to use the technology to track down and apprehend the Joker.