"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. Battery Type AA, Beam Type 90 split beam, Case Type Hard shell case, Class Rating Class IIIa, Battery Included Yes 4, Battery Life Approx. 24 hrs. of continuous use, Horizontal Leveling Yes, Interior Range ft. Up to 200, IP Protection Class IP 54, Laser Beam Color Red, Dimensions L x W x H in. 4 31/32 x 6 11/16 x 6 11/16, Exterior Range ft. Up to 800, Material Type Rugged housing, Self Leveling Range 3.5, Laser Output Illuminated vertical vial"