The TRYBE Optics 1x21mm Advanced Ruggedized Optic (ARO) Micro red dot sights have been ruggedized to withstand the violence of the fastest velocity pistol slides for a lifetime of dependable use. Our large fully multicoated window allows for an excellent field of view and maximum situational awareness from the draw or on the move, and our crisp red 3 MOA dot is the perfect size for precision work as well as providing an intense aiming point when speed is needed for defensive duties on narrow-slide primary or backup pistols. Light transmission is unparalleled due to high-tech glare-reducing and anti-scratch coatings that protect from damage as well as making cleaning easy. Oil and dirt wipe right off. Powerful daylight bright dot means a reliable aiming point no matter the time of day or target reflectivity. TRYBE ARO Micro has an RMSc footprint and low base height, allowing the use of factory height iron sights for cowitness, so you can ditch the higher sights that obscure vision as required on most other pistol-suitable micro sights. ARO Micro weighs just over half an ounce, so it will never interfere with slide velocity or pistol functionality. Digital operation means easy intensity adjustments which are sleek and streamlined against your body when carried. Modern, precise W&E adjustments nuts do not require additional lock nuts to hold zero. Adjustments are accurate and reliable. AutoLive motion activation immediately illuminates your dot, ensuring your sight is always ready for action. Standby mode activates after 2 minutes without movement to conserve battery life. Up to 40,000 hours of battery life when constant on at medium power. Our TRYBE Optics ARO Micro sight is ruggedized, sleek, powerful, clear, attractive, and ready to mount on all your most important EDC defensive pistols. ARO rivals any sight on the market and provides pride of ownership and battle-hardened durability you can count on when things go South. Check out the TRYBE Optics 1x24mm Mini Advanced Ruggedized Optic Red Dot Sight here. Specifications for TRYBE Optics 1x21mm Micro Advanced Ruggedized Optic Red Dot Sight: Manufacturer: TRYBE Optics Color: Black Finish: Matte Fabric/Material: 6061 Aluminum Magnification: 1 x Objective Lens Diameter: 21 mm Reticle: 3 MOA Dot Illumination Type: LED Illumination Color: Red Brightness Settings: 10 Eye Relief: Unlimited Adjustment Type: MOA Lens Material: Glass Optical Coating: Fully Multi-Coated Battery Type: CR2032 Battery Life: 40000 hours Water Resistance Level: IP67 Shockproof: Yes Gun Make: AR Platform Weight: 0.56 oz Quantity: 1 Red Dot Sights-Footprint: RMSc Gun Type: Long Gun, Handgun Features of TRYBE Optics 1x21mm Micro Advanced Ruggedized Optic Red Dot Sight:Fully Multi-Coated Glass LensHi-Tech Military Grade AdhesivesInstant On AutoLive Motion SensingAuto Shut Off Prompts Battery-Saving Standby Mode After 2 Minutes of InactivityTotal Power Down After 12 Hours of Power On or AutoLive Standby ModeIP67 Waterproof Design, Submersible 1 Meter for 30 MinutesSealed from Dust & Particles IngressShockproof/RecoilproofBright LED with Daytime Bright and Lowlight SettingsDurable Lightweight Aircraft-Grade 6061 Aluminum Alloy Housing Shields Lens from Impact10 Total Brightness Settings, Including 2 Night Vision Settings40,000-Hr Battery Life on Medium SettingCompact Lightweight DesignParallax-FreeUnlimited Eye ReliefFeatures RMSc Mounting Pattern for Plate or Slide MountingCompact 15.8mm Tall by 21mm Wide Lens Window Provides Clear Sight Picture60 MOA Adjustable Windage & ElevationDesigned to Fit Most Narrow-Slide Compact HandgunsWindage: 60 MOAElevation: 60 MOAObjective Lens Height: 15.8mm Package Contents:TRYBE Optics 1x21mm Micro Advanced Ruggedized Optic Red Dot SightCR2032 Battery3 Sets of Set Screws - Springfield Armory Hellcat, Glock 43X, Smith & Wesson Shield, SIG Sauer P3653mm Diameter, 0.5mm Thread, 10mm Length4mm Diameter, 0.7mm Thread, 8mm Length3.5mm Diameter, 6-32 thread, 13mm Length TRYBE Warranty TRYBE™ products are made for performance and durability and are covered by a comprehensive warranty depending on the type of product. See full warranty information