The Pro XT offers a 50% smaller retina lock for more precise aim down range. Micro adjustment knobs that allow quick and simple adjustment of the elevation and windage to precise positions. Retina Lock technology provides instant feedback that will identify even the slightest torque or anchor point change. Dual position mounting gives you the ability to mount your sight to your particular shooting style. Tool-free locking knobs allow you to lock your windage and elevation positions in place without the use of any tools. Optional sight light available.