Designed for indoor and outdoor applications, Electronically-controlled dual slope feature, Electronic self-leveling horizontally and vertically, Laser beam modes include dot, two adjustable line lengths and two rotational speeds, Two rotational speeds: 200 and 500 RPM, Visual and audible alarms when beyond leveling range, Height of Instrument/Tilt alarm function ensures product accuracy, 40-6526 Includes > Laser, 4 "C" alkaline batteries, tinted glasses, instruction manual with warranty card, soft-sided carrying case