The ELCAN SpecterOS4x Combat Optical Sight, 5.56 CX5755 Dual Illum. Ballistic Chevron Reticle, Picatinny Mount (SFOV4-A1) is an optically brilliant instrument for precision aiming.. With superior low light performance and extremely long eye relief, the SpecterOS4x outperforms competing 4x optical sights and, as a result, has been selected for general service by advanced military forces. Depending upon the situation, the user may light the central part of the reticle with brilliant LED illumination for CQB applications, or select lower-level illumination of the entire reticle for low-light operations. Because the reticle is etched in glass, it is plainly visible even in the case of loss of electrical power due to battery failure or EMP. The SpecterOS4x is an extremely rugged tool designed to withstand the rigors of modern professional use. The sight is covered with a one-year warranty against manufacturing defects. Magnification 4x Field of View (FOV), degrees 6.5 Exit Pupil, mm 7.8 Entrance Pupil, mm 32 Eye Relief, mm 70 CQB Illumination 5 settings (AN/PVS-22 night vision compatible) Whole Reticle Illumination 5 settings (AN/PVS-22 night vision compatible) Illumination Source Battery-powered LED Reticle 5.56 CX5755 Dual Illuminated Ballistic Chevron Fixed Focus Range, m 20 to Infinity Battery Type DL 1/3N (3v Lithium) Battery Life 600 hours minimum, 3000 hours average Ballistic Correction 100800m for 5.56 NATO Adjustment Resolution 0.5 minute of angle Adjustment Range 120 minutes of angle Base Requirement MIL-STD-1913 Picatinny Rail (Weaver compatible) Attachment ARMS Levers Waterproof 66 ft for 2 hours Shockproof 450 gs Dimensions (L x W x H), in 6 x 2.6 x 2.6 Weight, oz 17.4 (w/ battery) Elcan SpecterOS 4x Scope 5.56 NATO Chevron SFOV4-A1