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 easy-to-see 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 co-witnessing of iron sights. The red dot also utilizes convenient side buttons to add a magnifier and features an adjustable, locking, quick-detach 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 MIL-STD-1913 Picatinny rail.