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, 40-6516 Kit Includes > Laser, tinted glasses, 4 "AA" alkaline batteries, detector with 9V battery and clamp, instruction manual with warranty card, hard-shell carrying case