Perfect for home defense, or tactical scenarios where point-of-aim is essential or sights not visible. Turns on with pressure on/off switch. Fits Remington 870 12 gauge shotguns with magazine tube caps (not extended tubes). Does not reduce magazine capacity. Laser is red. Made by FM for the 12ga Remington 870 shotgun. Laser dot size is 2" at 165 ft. Length of unit is 3 inches. Weighs 5 oz.