With this laser detector, a line generated pulse laser level can be used both indoors with bright light and/or outdoors in the sunlight where the beams are not visible, Audible and visual indicators for precise leveling, Clamp attaches to grade rods, Use with 40-6602 & 40-6662 line-generating lasers with pulse, 40-6780 Includes > Detector, 9V battery, clamp