"The Rotary Laser Level features self-leveling in the horizontal plane and manual-leveling in the vertical plane with 90 split beam. Illuminated vertical vial. Visual and audible alarms when beyond leveling range. Battery Included Yes 4, Battery Life Up to 24 hrs. of continuous use, Battery Type AA, Beam Type 90 split beam, Dimensions L x W x H in. 4 31/32 x 6 11/16 x 6 11/16, Exterior Range ft. Up to 800, Horizontal Leveling Yes, Case Type Hard shell case, Class Rating Class IIIa, Laser Beam Color Red, Laser Output Locking mechanism protects inner pendulum during transit"