Green light is proven to be easier to see in daylight conditions, and the Viridian RFX11's bright 3 MOA dot gives you a clean, simple aim point that's easy to pick up every hour of the day. Even better, ambient light-sensing technology automatically adjusts the reticle's brightness to match any light condition, so you always have the right dot for the job. The RFX11 also features Viridian's innovative INSTANT-ON technology: when used with an INSTANT-ON compatible holster (sold separately), the unit comes to live when you draw your pistol-no need to fumble with switches or settings. 3 MOA green dot reticle is easy to pick up day and night Automatically adjusts reticle brightness to match light conditions 30,000+ hours of battery life INSTANT-ON technology brings the unit to life instantly when used with a compatible holster (sold separately) Rugged polymer construction Fogproof and shockproof Automatically shuts off after 2 minutes Fits Shield RMSc footprint, and includes a Picatinny mount Fits most optics-ready pistols