Olight Osight SE Overview Boasting a side-loading battery that saves a lot of trouble, the Osight SE Enclosed Optic Pistol Sight from Olight will inspire confidence in your targeting. The Osight SE offers all the advantages of reflex sights: fast target acquisition, both-eyes-open situational awareness, unlimited eye relief, and parallax-free performance. The CR1620 battery loads from the side while mounted on your pistol, so there&';s no need to remove, reattach, and re-zero. The reticle can be set to one of eight brightness levels for daytime use or two for use with night vision gear. Impact point adjusts at one MOA per click with the included tool. Long Runtime The Osight SE runs for up to 75,000 hours (Level 3, dot only). Reticle The 6 MOA green dot is easy to see in any light condition. Large Sight Window Featuring a 0.83 x 0.55" window, the optic ensures fast and accurate target acquisition and makes for successful follow-up shots. 10 Brightness Settings Manually choose from eight daytime brightness settings and two for use with night vision equipment. Motion-Activated and Auto Shutoff The Osight SE comes on when the pistol is moved and shuts off automatically after three minutes of inactivity. Universal RMSc Footprint Fitting directly to your optics-ready slides, the compact optic delivers widespread compatibility, ensuring seamless integration across a multitude of builds. Low Battery Warning The reticle blinks three times each minute once the battery has dropped below 2.2V. IPX7 Water Resistance The fully enclosed system withstands being submerged more than three feet deep. Proprietary Auminum The 7075 aluminum housing is strong and sturdy, yet keeps the sight&';s weight below one ounce.