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Make it easier to see the path of your arrow and retrieve it after the shot with BlackOut® Lighted Nocks. Featuring a trustworthy, patented linear switch design, this wire-free design activates with the push of your bowstring every time. Convenient opening in the side of the nock makes it easy to switch the light off with a small screwdriver or tip of most broadheads after you retrieve your arrow. Runs for 20+ hours on its lithium battery. Bright design for easy spotting in daylight or darkness. Weighs approximately 15 grains.