Feature A Direct MOS Mounting: Fits GLOCKA(R) Standard MOS Pistols Mounts Directly Without Adapter for Lower Sight Height and Streamlined Setup A Natural Co-Witness View: Low-Profile Mounting Height Creates a Lower Sightline for Smooth Alignment w/ Factory Iron Sights in Practice A Lightweight Precision Design: 3 MOA Dot with 16 x; 21 mm / 0.63 x; 0.83 in Window and 33 g / 1.16 oz Build Optimized for Pistol Use A Automatic Power Activation: Motion Sensor Turns Sight On and Off Eliminating the Need for Manual Switching During Use Smoothly A Quick Battery Replacement: Side-Loading Battery Design Enables Fast Changes Without Removing Optic or Losing Zero in Field Conditions Specification See our Terminology Guide for detailed explanations of each specification. SCRD-81 Frenzy 1x16x21 Standard MOS Red Dot Sight Specification Details Magnification N/A Window Lens Size 16x21 mm / 0.63x0.83 in Parallax Free ( 2 MOA) Parallax Setting 50 yards Dot Size 3 MOA Dot / Reticle Color Red Sensor Motion Sensor Click Value 1 MOA Elevation Adjustment Range 120 MOA Windage Adjustment Range 120 MOA Footprint Fit for GLOCKA(R) Standard MOS Pistols Mounting Rail N/A Illumination Setting 11 Gears (9 Daytime + 2 NV) Battery Type CR1632 Battery Placement Side Loading Waterproof IPX7 Shockproof 1500G Working Temperature -20 ~ +60 Housing Material 7075-T6 Aluminum Alloy Mount Material N/A Finish Black Matte Weight 33 g / 1.16 oz (Battery included) Items in the Package Hex Keys, Vekey, Cleaning Cloth, User Manual, etc. Size Footprint A Original Compatible Pistol Optics-Ready (O.R.) Model: Fit for GLOCKA(R) MOS Standard, Walther PDP 2.0 Standard, ect, directly mounts to pistol optics ready-to-use components without requiring an adapter. For more information about FOOTPRINT, please refer to the blog. Download User Manual Frenzy Red Dot Sight Video