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The Nockturnal Lighted Nocks are described by Lancaster Archery TechXPert Justus Leimbach. The nocks function like any other arrow nock in holding the arrow on the bowstring. At the shot, a battery-powered light is activated. Leimbach describes how to turn off the light after the arrow is recovered.The light makes it easier for the archer to follow the arrow's flight. Also, it helps a bowhunter find the arrow after it's been shot at game - especially after dark.