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