Chinoook Tactical Rifle Red and Green Reflex Dot Sight with 4 Reticles Parallax corrected & unlimited eye-relief; Allen head screw type windage and elevation click adjustments, with locking screw Ultralight, waterproof and shockproof - Powered one 3V lithium battery (included) Bulit-in mount for standard bases, no need to rezero when remounting the dismounted sight Multi-Reticle (4 patterns) or variable Dot (4 different sizes) are installed