Self-Leveling Rotary Laser Level 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. Laser Wavelength: 635nm±10nm, Battery Type: AA, Horizontal Leveling: Yes, Case Type: Soft sided case, Battery Life: 20 hrs. of continuous use, Battery Included: Yes (4), IP Protection Class: 54, Single, Pair, or Set: Set, Leveling Type: Self-leveling (pendulum), Indicator Type: Visual and audible, Working Temperature: 14deg F to 113deg F, Vertical Leveling: Yes, Class Rating: Class IIIa, Dimensions L x W x H (in.): 4 31/32 x 6 11/16 x 6 11/16, Laser Output: <5mW, Laser Beam Color: Red, Visual or Audible Indicator: Visible and audible, Interior Range (ft.): Up to 200, Exterior Range (ft.): Up to 800, Self Leveling Range: ±3deg , Accuracy: 1/8 in. per 50ft., Rotation Speed: 200, 400, 600 rpm Variable, Tripod Mount Dimensions (in.): 5/8-11 center screw thread, Beam Type: Vertical laser plane w/90deg split beam