It's a device that mounts near your sights. It has a dot and a circle that you can only see when you are at your proper anchor point. To set up, draw to your normal anchor point. Adjust the no peep up, down, left and right so that you see the dot inside the circle at your proper anchor pt. Now all you have to do is draw and make sure the dot is in the circle to know your anchor is consistent and shoot away. It works great, especially in low light. I can see mine even after I can't see my Trophy Ridge pins that practically glow like a Christmas tree. It will make you a better archer by making sure you are consistent on your anchor. My bro in law used his for a while then took even that off so now it is just the kisser. I highly recommend it.