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, 40-6515 Includes > Laser, tinted glasses, 4 "AA" alkaline batteries, instruction manual with warranty card, soft-sided carrying case