Monstrum Tactical S330P Ultra-Compact 3x Prism Scope Compact yet heavy duty prism sight with 3x magnification and 30mm objective lens, Ideal for rapid mid range target acquisition out to 500 yards. Features a glass prism optical system rather a refracting lens system like traditional scopes, allowing for better optical quality in a much smaller package. Unlike red dots, the reticle is visible with or without illumination, for a clean sight picture regardless of lighting or environment. Only 15 ounces in weight and 5 inches in length. All Monstrum Tactical Rifle Scope products are backed by a one year warranty. Black or Flat Dark Earth finish Prism Optical System Illuminated Reticle Optional Flip-up Lens Covers CR2032 3V battery (installed)