Ohuhu Red Dot Sight, 4 Reticles Red Green Dot Gun Sight Scope Reflex Sights, Black/Sand Tubeless design with 33mm reflex lens aperture provides a wide field of view Multi-reticle (4 patterns) or variable dot (4 different sizes) are installed Built-in mount for standard bases, no need to rezero when remounting the dismounted sight Parallax corrected & unlimited eye-relief, Allen head screw type wind age and elevation click adjustments, with locking screw Ultralight, waterproof and shockproof - powered one 3v lithium battery (included)