The BSA Boss Series was designed toestimate the ranges to objects of knownsize, the size of objects at known distances,and even compensate for bullet dropsat wind drifts. Waterproof/fogproof andshockproof. Features: Fully MulticoatedOptics, Push/Pull torrets, Erector TubeCoil Spring, Specially designed turkey/deer reticle with a illuminated Red/Green/Blue Dot reticle adjustment knob, LimitedLifetime Warranty.