Locking mechanism protects inner pendulum during transportation. Self-leveling in the horizontal plane. Manual leveling in the vertical plane with 90 deg. split beam. Visual and audible alarms when beyond leveling range. Laser rotates at 200, 400, 600 RPM. Illuminated vertical vial. Kit includes: Self-leveling rotary laser level, 4 "AA" alkaline batteries, wall-ceiling mount, 8' 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.