Theta Optics TO551 scope is powered with four LR44 batteries (included), which construction has been modeled on the holographic crosshairs. User may choose the red or green reticle. The product allows you to take action either during the day or night. Aiming point can be easly regulated vertically and horizontally. It has also several degrees of intensity. The scope, which is designed to be mounted on a standard 22mm RIS rail, helps you to aim rapidly and precisely. It all has been closed in the durable metal housing.