RE: easton tracer nocks
Yes they do activate with an magnet. It is a small round magnet that comes with the nocks. The magnet has a velcro back and a sticky side that sticks to the riser of your bow near the rest where the nock will go by when shot. I however glued my Magnet to the moleskin I have on the riser of my bow , because the sticky side didnt hold throughout the hunting season.
I have heard from others that the nocks will work 99% of the time without the magnet as well??? I have never had to try!