EOTech is a leader in imaging innovation and provides rugged reliable and innovative products that offer a true advantage to all who use them.The EXPS2 allows you to achieve faster target acquisition with the easytosee Green reticle that is approximately 6X easier to see than red in daytime. It also maximizes rail space with its compact size and allows for cowitnessing of iron sights. The red dot also utilizes convenient side buttons to add a magnifier and features an adjustable locking quickdetach lever for easy attachment and removal.This model has a 68 MOA ring w single 1 MOA dot reticle uses a 123 lithium batter not included and is compatible with 1 Weaver and MILSTD1913 Picatinny rail.