Lock-out device

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A lock-out device is a system used on game shows, particularly trivia shows, to determine in real time which contestant has activated their signal first. The system is designed to detect the first signal it receives and ignore subsequent signals. The system provides some indication of which contestant has signaled, such as a light or sound for each contestant, allowing the relevant parties to clearly determine who has signaled first.^{[citation needed]}

Perhaps the most famous modern game show to use a lock-out device is Jeopardy!, which uses a sophisticated system that is so fundamental to the game, mastering the signaling device is commonly said to be at least as important as knowing the correct response to each clue.^[1]

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