Zulisy OWL features Shake to Wake. After 4 minutes without motion, your red dot goes to sleep. It automatically turns on when it is moved, effectively extending the battery life. A single CR1632 battery can be used for up to 50,000 hours of operation(4,000 at the highest brightness settings). (Shake to Wake will NOT work when manually turned off).This 3 MOA micro red dot sight is Doctor/ Vortex Viper/ Burris Fastfire footprint compatible. It comes with an optional but pre-attached picatinny adapter and as well as several screws with commonly used thread patterns..Utilizes tactile 1 MOA per click windage and elevation adjustments. With 10 different brightness settings, including 2 for use with NV enhanced brightness devices at night time..This optic is conservatively rated IPX7 Waterproof. With a top-loading battery that makes changing a breeze, you will not have to dismount the optic. The solid aluminum unibody housing ensures this unit is ready for rugged situations..Zero parallax at 50 yards. Tactile high activation pressure, flush sitting buttons, for use with open or concealed carry to prevent accidental button presses.