The Rotary Laser Level features self-leveling in the horizontal plane and manual-leveling in the vertical plane with 90deg split beam. Illuminated vertical vial. Visual and audible alarms when beyond leveling range. Horizontal Leveling: Yes, Battery Life: Up to 24 hrs. of continuous use, Vertical Leveling: Yes, Exterior Range (ft.): Up to 800, Battery Type: AA, Case Type: Hard shell case, Class Rating: Class IIIa, IP Protection Class: 54, Single, Pair, or Set: Set, Beam Type: 90deg split beam, Visual or Audible Indicator: Both, Accuracy: ±1/8in./50ft, Rotation Speed: 200, 400, 600 rpm Variable, Laser Beam Color: Red, Dimensions L x W x H (in.): 4 31/32 x 6 11/16 x 6 11/16, Tripod Mount Dimensions (in.): 5/8in.-11 center screw thread, Self Leveling Range: ±3deg , Indicator Type: Visual and audible, Interior Range (ft.): Up to 200, Working Temperature: 14deg F to 113deg F, Laser Wavelength: 635nm±10nm, Leveling Type: Self-leveling (pendulum), Laser Output: <=5mW, Battery Included: Yes (4)