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. Precision lighted nocks for arrows Trustworthy, patented linear switch design - wire-free design Activates with the push of your bowstring Easy-to-use nock design - deactivates with a small screwdriver or broadhead tip Lithium battery - runs for 20+ hours Easy-to-see design Approximately 15 grains