"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. Exterior Range ft. Up to 800, Horizontal Leveling Yes, Single, Pair, or Set Set, Laser Wavelength 635nm10nm, Indicator Type Visual, audible, Battery Type AA, Interior Range ft. Up to 200, Laser Beam Color Red, Rotation Speed 200, 400, 600 rpm Variable, Dimensions L x W x H in. 4 31/32 x 6 11/16 x 6 11/16, Accuracy 1/8 in. per 50 ft., Battery Life 20 hrs. of continuous use, Battery Included Yes 4, Working Temperature 14F-113F, Vertical Leveling Yes, Case Type Soft sided case, IP Protection Class 54, Leveling Type Self pendulum, Self Leveling Range 3, Tripod Mount Dimensions in. 5/8-11 center screw thread, Class Rating Class IIIa, Visual or Audible Indicator Visible, audible, Beam Type Vertical laser plane w/90 split beam, Laser Output 5mW."