Perfect for small jobsites, this rotary self levels in the horizontal plane and manually levels in the vertical plane. The rotary also features an illuminated vertical vial and adjustable rotational speeds of 200, 400 or 600 RPM. Accuracy is never a problem thanks to the visual and audible alarms that alert you when the rotary is beyond its leveling range and the locking compensator that protects the inner pendulum during transport. With the included wall/ceiling mount, 8-foot grade rod, detector and clamp, tinted glasses, magnetic target, elevating tripod and hard-shell carrying case, this leveling system will get your jobsite up and running! PRODUCT DETAILS40-6517 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, and hard-shell carrying case. 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 Accuracy  ±1/8"/50 ft.  Battery Life Approximately 20 hours continuous use Center Screw Thread 5/8"-11 Dimensions 6.61" x 4.96" x 6.69" Exterior Range Up to 800 ft. diameter with detector (included in 40-6516 and 40-6517) Interior Range Up to 200 ft. diameter depending upon light conditions IP Protection Class 54 Laser Classification Class Illa Laser Wavelength 635nm±10nm (Red) Leveling Method Self-leveling (Pendulum) Maximum Power Output ±5° Power Supply 4 "AA" alkaline batteries (included) Rotation Speeds 200, 400, 600, RPM Self-Leveling Rande ±3° Working Temperature 14°-113°F Weight 3.30 LBS Johnson Self-Leveling Rotary Laser System