It is the sights ability to react to the shooters needs:

• Ultra wide field of view
• 8 reticle choices
• Color change as quick as a button push
• Uses mulituple power sources
• Parallax perfect paralax correction
• 120 hz cet Led Refracting Diode for a seemless reticle view

All of these can react to the shooters needs lessening the reaction time of the shooter by full seconds.

*Magnification:  N/A

*Tubeless Sight Window Lens Size:  39x27mm

*Exit Pupil:  39-27mm

*Length:  110mm (4.1 inch)

*Width:  53mm (2.1 inch)

*Height:  63mm (2.5 inch)

*Weight (net):  260g (9.2 ounce)

*Eye Relief:  Free

*Optics Coating:  Multi Coated

*Reticle:  Exclusive 8 patterns

*Brightness levels:  Six red & green

*Parallax:  < 3’ at 50 yards

*Elevation Range:  60 MOA

*Windage Range:  60 MOA

*Battery Type:  LIR2032 3.6V (not include)

*Shock proof, IPX4 water resistant and fog proof

*High quality aluminum alloy in durable black matte finish

*Integrated 21mm quick release weaver mount base for picatinny rail and weaver rail

*Package includes:  cleaning cloth and hex keys