The best just got better. The 518 runs on easy to find AA batteries but offers all of the features found in EOTechs EXPS top of the line sight. With side button functionality you can reduce rail space when partnering the 518 with an EOTech magnifier. The 518 is also compatible with the new drop-in Laser Battery Caps that EOTech designed to enhance aiming through the use of visible and IR lasers. Not night vision compatible.Features : Water Resistant Fits weaver or MIL-STD-1913 rail Supports lithium, alkaline, or rechargeable AA batteries 20 daylight settings