Other red dots are made for competition. The Vortex Defender-XL is built to win. Target to target. Stage to stage. Designed for toughness, speed, and accuracy, it withstands unexpected drops and the rigors of dynamic shooting. The ultra-wide sight window enhances field of view for quicker target acquisition, faster follow-up shots, and greater flexibility in unconventional shooting positions - all positioning you to dominate every round. Auto-Shutoff: The red dot will automatically shut off after 10 minutes. Powering down the red dot manually will disable the auto-shutoff feature. To engage or disengage the auto-shutoff press and hold the up and down buttons for three seconds. When the auto-shutoff is disengaged the dot starts at the highest brightness setting then decreases brightness to the lowest brightness setting over three seconds. When the auto-shutoff is engaged, the dot starts at the lowest brightness setting then increases brightness to brightest setting over three seconds. Button presses are not allowed during that three second period. Motion Activation: The Defender-XL(TM) is equipped with motion activation. This feature is only available when the auto-shutoff feature is turned on. By allowing the unit to shut off automatically after 10 minutes, the dot will turn on automatically the next time you pick up your gun. Powering down the red dot manually will disable the motion activation. Included in the Box: Glock MOS Adapter Plate Picatinny Rail Mount Rubber Cover Lens Cloth Battery Custom Tool 5 Sets of Common Mounting Screws