The Double Take Archery Nockturnal X Nock feature a string-activated linear switch located deep inside the nock so it can't fail. Clear plastic for super visibility-can be seen hundreds of yards away. Weighs 25-50% less than other lighted nocks. Nockturnal X Nock fits all standard sized X Nock arrows including Axis and Gold Tip Kinetic Arrows. Check your state laws and regulations for use in your area. 3 Pack
This is by far the best lighted nock on the market today. I must say that I tried the lumenok, I was completely disappointed with the lack of brightness that the lumenok has. I have compared them side by side and Nocturnal was the winner hands down. I will never make the mistake again on going out and getting something else. Nocturnal lighted knocks for life.