Set a new standard in lighted nock technology with the Lumenok GT Lighted Nocks. The patented Lumenok activates by the force applied to it upon release of the arrow and deactivates by slightly pulling the nock back as to break the contact. Lumenok Lighted Nocks have helped millions of shooters see blood trails, make blood trails, drop a blood trail, find their fallen arrows, and much more. The Lumenok Lighted Nock is activated by the force applied to it upon release of the arrow which is the same as a firer in a gun. Once the arrow passes the nock, the light stays on until it goes out or until it wears down from use. Try out the new Lumenok GT Lighted Nocks in hunter green for an added boost of lighting on your hunts.