For example, Leupold's Motion Sensor Technology (MST) turns off illumination after five minutes of inactivity, but when any motion or vibration is detected, it instantly switches on illumination at the previous brightness setting. Motion-on (shake-awake) optics automatically switch on illumination using a motion sensor that detects motion or vibration. A motion sensor will burn up your battery while you are hiking. For hunting applications where you may need to hike into your hunting area, a tilt sensor will extend battery life by switching off the illumination while the rifle is slung.
A tilt sensor will switch off your illumination if you try to use it laying on its side. For home defense, tactical or competition applications where you may need to shoot while laying the rifle on its side, select an optic with a motion sensor. When you position the rifle in a shooting orientation, the tilt sensor switches on the illuminaiton. Tilt-off optics automatically switch off illumination (to save battery power) using a tilt sensor that detects the orientation of the optic relative to the vector of gravity (plumb). Motion-on (shake-awake) Tilt-on Tilt-off illumination Technically, "Shake-awake" is a trademark of Holosun, which uses motion sensors on a number of different reflex red dot sights, but here we're using it generically to refer to optics that use motion sensors to automatically switch on illumination. Shake-awake is usually paired with an "auto-off" feature (using either a timer or tilt sensor) to extend battery life. Shake-awake technology uses a motion sensor to detect movement and switch on the optic's illumination.
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The Aimpoint PRO is a classic example of an optic with multi-year battery life that you can just leave turned on, and therefore is always ready to go, or As long as the optic does not have an auto-off timer, the optic can be turned on and left on for home defense purposes.