The Bear Creek Arsenal Smart Red Dot Sight has a built-in mini laser rangefinder to give users the added benefit of precise distances and angles displayed on the OLED screen. Also, holding the button for a longer time gives you the added capability to switch the optic setting to scan mode which allows you to quickly range multiple objects at different distances in real time. Easily change between yards and meters. With easier ranging and aiming, firing on target becomes a breeze with this optic installed. Comes with a waterproof hard-shell case to take on the go anywhere you need! Judge target distances quickly RANGE UP TO 400YD Suitable for all kinds of Firearms Highly precise CNC machined Excellent performance Easy to install: Rail Slots for Picatinny Rails Installed Quickly replace battery (CR2 Battery needed) 10 brightness adjustments: 4 MOA Dot with multiple intensity levels Dimensions in mm: 115.8 x 50.3 x 68.5 Weight:440g