The MEPRO TRU-VISION(TM) MIL-SPEC sight offers advanced features such as small dimensions, lightweight (approx. 280g), and a built-in light sensor. The MEPRO TRU-VISION(TM) electro-optical MIL-SPEC red dot sight is shockproof, waterproof, and durable. Its short-length, compact, and lightweight design addresses the need for co-mounting multiple tactical devices (magnifiers, laser pointers, etc.) on your Picatinny rail. In addition, the MEPRO TRU-VISION is compatible with the Mepro MX3F/T magnifier and other popular models to facilitate engaging targets at intermediate shooting distances. Energy-efficient, it provides thousands of operating hours from a single "CR123" Mfg: Meprolight