Manual levelling laser projects a laser line along the wall. Projects horizontal and vertical lines. Ideal for: Installing shelves. Hanging curtain rods and blinds. Hanging pictures. Hanging a series of pictures down stairways at an angle. Hanging ornaments. Total visible line span 3m. 2x AA batteries required. Size (H)28.2, (W)13, (D)9cm. Manufacturer's 2 year guarantee.