Bushnell Trophy 1x 28mm Riflescope Red Dot Sight with Auto On/Off Innovative, highly accurate 1x28 matte riflescope with fully multi-coated optics Amber-Bright lens coating helps distinguish between brown tree and brown critter Optics guarantee increased brightness in low-light conditions; dry-nitrogen filled Auto red dot sight stays on when gun is in shooting position; includes CR2032 battery 4.1-inch mounting length; measures 5.5 inches long and weighs 7 ounces