Developed to improve precision and accuracy with any style or caliber of weapon, RMR Reflex Sight - Adjustable LED 6.5 MOA Red Dot (RM07) is designed to be as durable as the legendary ACOG.RMR (Ruggedized Miniature Reflex) ensures optimum visibility of the red dot against the target in any lighting situation. This model features a high efficiency LED and has automatic and manual brightness controls. The Adjustable LED RMR is powered by a long-life lithium CR2032 battery that delivers 17,000 hours of battery life or more. With eight available brightness settings, the reticle can be manually adjusted by pressing the plus or minus buttons on either side of the unit. To switch to auto adjust mode simply press both buttons simultaneously and release. To save battery life turn the optic off by pressing both buttons simultaneously and holding for 3 seconds. Accuracy is further enhanced with adjustments for windage and elevation.