The Lumenok Signature red is activated upon the shot to allow archers to follow the path of their arrow. This model Lumenok allows for the battery to be easily changed to ensure bright operation. No magnets required for activation. This Lumenok is made using a Signature Nock from Bohning. Replaceable Battery - Polymeric battery holder allows for battery replacement and protection against failure due to hard impacts! Also reduces total weight by 7 grains! Approved Models Per Manufacture: PSE: Carbon Force Radial X Weave Carbon Tech: Cheetah, Whitetail, Rhino, Safari Easton: Lightspeed, Powerflight Beman: ICS Hunter Carbon Express shafts: Aramid, Maxima, CX Hunter, Heritage