It's a fact that the human eye can pick up green much better than red. Viridian now adds the RFX45 Closed Emitter Green Dot Optic to its RFX line. The new green-dot has many features that set it apart from others, such as machined 6061 aluminum housing, fully multi-coated lenses, audible and tactile adjustability, instant-on activation and an auto shut-off. The RFX45 comes standard with an ACRO-compatible mount with other mounts available as well. The battery runtime is about 50,000 hours.