Barska Tactical Red Laser Sight with Flashlight and Mount... hair-splitting accuracy at up to 500 yards! This lithium battery-powered Sight really ups your accuracy and precision in the field. The Sight fits on most 1" scope tubes and produces a red dot on your target of choice, leaving no doubt in your mind where your shot is headed. The Flashlight attaches to the same mount as the Sight, helping you illuminate the shot in close-quarters situations. Simple to use, durable aluminum construction will last and last.Specs:Sight and Flashlight are allen wrench-adjustableSight has 31 mm tube diameter Output power < 5mW Wave length: 635-655 nm Operates on 4 CR-123A LR-44 lithium batteries (included).