The Meprolight Mepro M22 Is The Next Generation Of The Legendary Mepro M21 Reflex Sight, Used For Decades By The Israeli Defense Force, Militaries, And Law Enforcement Agencies Worldwide. Smaller And More Compact, The Mepro M22 Is A Reflex Sight With Fiber-optic Illumination By Day And Premium Swiss Made Tritium Vials By Night That Will Perform In Any Lighting Condition With No Need For Batteries, Ever. The Transition Between The Two Systems Is Instantaneous And Automatic. It's Rugged, Battle-proven Construction Meets Or Exceeds Rigorous Standards To Thrive In The Harshest Environments. Extremely Reliable In Any Weather Conditions, The Mepro 22 Is Suitable To Use With NVDS As Well As Magnifiers. Tritium Luminance Is Warrantied For Ten (10) Years. .