EOTECH 518 Holographic 1x Red Dot - Circle 1-Dot - With the HWS 518, the best just got better. Get all of the features found in EOTECH's top sight, the EXPS, but with easy-to-find AA batteries. The 518 has buttons on the side that allow the user to position it close to the magnifier to reduce rail space. Features a heads up design that allows both eyes to be open in order to maintain peripheral vision and depth perception while shooting. A65 Quick Detach Included in the box: HWS 518 Quick-Start Guide Warranty Card 2x AA Alkaline Batteries Protective Case