Self-leveling in horizontal plane, Locking mechanism protects inner pendulum during transportation, Manual-leveling in the vertical plane with 90 degrees split beam, Visual and audible alarms when beyond leveling range, Laser rotates at 200, 400, 600 RPM, Illuminated vertical vial, 40-6517 System Includes > Laser, 4 “AA” alkaline batteries, wall-ceiling mount, 8 ft. grade rod, detector with 2 “AAA” alkaline batteries and clamp, tinted glasses, magnetic target, elevating tripod, instruction manual with warranty card, hard-shell carrying case