*50,000 hours of battery life: 5+ years of continuous-on battery life at brightness setting 6*IPX7 Waterproof: IPX7 waterproof and fogproof*2 T1/T2 compatible mounts: includes both a 1/3 quick detach (QD) bottom mount bracket and low rise bracketThe AXIOM II is made to withstand a lifetime of constant recoil & impact. An enhanced high-efficiency emitter design provides a 50,000-hour battery life - which is over 5 years of continuous use. We asked ourselves, "e;why are QD High Mounts always an extra 65+ bucks add-on?"e; There was never a good answer so we changed that and made it standard in this bundle.