The TRUTH of the matter is this: you won't find a clearer way to lock in and bring down your target with more confidence. The Truth with ClearShot technology provides instantaneous feedback on your shot clearance. This advanced laser technology takes the guess work out of archery shots, even allowing hunters the ability to no longer worry about clipping branches or hitting other obstructions. And with a simple three-step process, you can calibrate the rangefinder to correspond with the speed of the bow through the sight system. When done and a target is ranged, a dot is displayed to show the max height your arrow will travel. The Truth with ClearShot ranges out of 850 yards with a "shoots like" distance of 200 yards. And it even shows the angle of your shot in the process. All that, combined with our exclusive Angle Range Compensation (ARC), make this the ultimate rangefinder for bow hunters. 3-Volt CR123 battery included.