Holosun HE509T X2 Enclosed Reflex Optical Red Dot Sight 2x 0.66 x 0.9 in Green LED Flat Dark Earth HE509T-GR X2 FDE. Shake Awake technology activates the LED during periods of motionlessness and can extend battery life to upto 100K hours in some cases. These Red Dot Sights are encased in durable Grade 5 titanium housing that withstands seawater all while keeping fatigue at bay. Specifications for Holosun HE509T 2x 0.66 x 0.9 in Reflex Red Dot Sight: Manufacturer: Holosun Fabric/Material: 7075 Aluminum Magnification: 1 x Magnification Type: Fixed Objective Lens Diameter: 0.66 - 0.9 in Objective Window Size: 0.66 x 0.9 in Illumination Type: LED Eye Relief: Unlimited Adjustment Type: MOA Adjustment Click Value: 1 MOA Optical Coating: Multi-Coated Battery Type: CR1632 Lithium Battery Quantity: 1 Water Resistance Level: IP67 Height: 1.35 in Package Type: Box Quantity: 1 Red Dot Sights-Footprint: Holosun 509T Condition: New Features of Holosun HE509T 2x 0.66 x 0.9 in Reflex Red Dot Sight: CR1632 battery port does not require removal of optic from firearm. Improved programming that enhances usability. Addition of Lock Mode: Lock mode locks out the buttons until a deliberate long press unlocks them. Improved glass clarity. Auto mode now runs in the background and offers solar power when there is no battery or dead battery. Up to a 50000 Hour battery life. Solar Failsafe. Multi-Rectical System (MRS): 32 MOA Circle & 2 MOA Dot; 2 MOA Dot; 32 MOA Circle. Shake Awake Technology. CNC Milled 7075 Aluminum Housing. Reticle Brightness: 10 Daylight & 2 Night Vision Compatible Settings. Package Contents: Holosun HE509T 2x 0.66 x 0.9 in Reflex Red Dot Sight RMR-to-509T Adapter T10 L Key User Manual CR1632 Battery Lens Cloth Holosun HE509T-GR X2 FDE: HE509T X2 Enclosed Reflex Optical Red Dot Sight Green LED Flat Dark Earth