Easton actually bought out Tracer Nocks, they've been around for several years, they are the best in my opinion!! They were one of our sponsors, which we'll see with Easton buying them out if that will continue. They are activated by a magnet on the riser, and they are 2x brighter than a lumenok, the good thing is you can pull the nock and actually change the battery on them as well! They are much more reliable than Lumenoks as well. Also the new Smart Tracers are great, they will activate then after 10seconds, they will flash, this saves battery life, but the nice sideaffect of it is that you can see it plain as day when it is buried in the ground, I could pick it right out with the naked eye at 50-60 yds. out in the forest floor burrowed down in the leaves!