This Barska rifle scope is six scopes in one The Barska multi-reticle system is adjusted by standard 1/4 click windage and elevation knobs. Once you have sighted in your rifle scope you can then change the reticle to any of 6 high-contrast reticles. The digital reticle system is powered by one CR 2032 3V lithium battery (included) which will power the reticle for hours of continuous use. The Barska Digital Multi-Reticle Riflescope also features fully multi-coated optics CO2 dry nitrogen purged and o-ring sealed for complete waterproof/fogproof protection. The rifle scope has a 1" inch main tube with a shockproof high impact rated design to withstand repeated abuse in rugged shooting conditions.