Self-Leveling Rotary Laser Level tools can be used for installing cabinets and drop ceilings, and for accurately framing walls and concrete projects. A locking mechanism protects inner pendulum during transport. Visual and audible alarms when laser drifts beyond leveling range. Leveling Type: Self-leveling (pendulum), Beam Type: 90deg split beam, Laser Beam Color: Red, Laser Wavelength: 635nm±10nm, Battery Type: AA, Class Rating: Class IIIa, Battery Life: Approx. 24 hrs. of continuous use, Working Temperature: 14deg F to 113deg F, Single, Pair, or Set: Set, Exterior Range (ft.): Up to 800, Battery Included: Yes (4), Dimensions L x W x H (in.): 4 31/32 x 6 11/16 x 6 11/16, Vertical Leveling: Yes, Visual or Audible Indicator: Both, Tripod Mount Dimensions (in.): 5/8in.-11 center screw thread, Accuracy: 1/8 in. per 50ft., Horizontal Leveling: Yes, Rotation Speed: 200, 400, 600 rpm Variable, Self Leveling Range: ±3.5deg , Interior Range (ft.): Up to 200, Laser Output: <=5mW, Material Type: Rugged housing, Case Type: Hard shell case, IP Protection Class: IP 54