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