Accelerated accuracy that takes up just 2.75 of rail space. The EXPS2 HWS features green-reticle technology approximately 5X easier to see than red in daylight and leaves plenty of rail space for adding a magnifier and other attachments. Durable, lower third iron sight co-witness and ergonomic, side-button adjustment all in a rock-solid unit with an adjustable, quick-detach locking lever. Features Auto Shut Down at 8 hours.