Osight Osight K Reflex Red Dot Sight 1x 21x14mm Red 6 MOA Dot Black OSIGHTKRD. Compared to its predecessors the Osight K uses an easily replaceable battery so you're always ready to go without waiting for a charge or dealing with the hassle of a charging cover. The Osight K offers 10 brightness settingstwo optimized for night vision and eight for daytime use. The aspherical lens provides zero distortion and parallax-free performance delivering exceptional clarity through the large window for quick target acquisition. The optic is easy to zero in with both windage and elevation adjustments ensuring consistent accuracy. The Osight K also includes a motion sensor that activates with movement and powers down after 3 minutes of inactivity (this feature can be disabled if desired).Powered by a CR1620 battery the Osight K offers up to 63000 hours of runtime at the lowest daytime brightness. When its time to replace the battery the reticle blinks three times every minute to indicate the need for a swap. To replace it simply unscrew the side battery housing and pull out the side battery loader for quick access. Compact and lightweight the Osight K measures just 1.59 inches in length and weighs only 1.02 ounces keeping a low profile. With an IPX6 waterproof rating and a durable 7075 aluminum housing its built to deliver reliability and toughness in any environment. Specifications for Osight Osight K 1x 21x14mm Reflex Red Dot Sight: Manufacturer: Osight Color: Black Fabric/Material: 7075 Aluminum Magnification: 1 x Objective Window Size: 21x14 mm Reticle: 6 MOA Dot Illumination Type: LED Illumination Color: Red Brightness Settings: 10 Eye Relief: Unlimited Adjustment Type: MOA Adjustment Click Value: 1 MOA Emitter Type: Open Parallax: Parallax Free Battery Type: CR1620 Battery Quantity: 1 Operating Temperature: -22 - 140 Fahrenheit Weather Resistance: Waterproof Water Resistance Level: IPX-6 Length: 1.59 in Width: 0.98 in Height: 0.98 in Weight: 1.02 oz Magnification Type: Fixed Red Dot Sights-Footprint: RMSc Features of Osight K 1x 21x14mm Reflex Red Dot Sight Features a 6 MOA red dot Features 10 brightness settings: 2 for night vision 8 for daytime use Activate the motion sensor function to turn on the optic with any movement Easy to remove battery so you don't have to rely on charging Package Contents: Osight Osight K 1x 21x14mm Reflex Red Dot Sight Osight OSIGHTKRD: Osight K Reflex Red Dot Sight 1x 21x14mm Red 6 MOA Dot Black