Layout Laser Kit Accuracy +/-1/4 in @ 100 ft Battery Type AA Features Focused Laser Beam Keeps Dot Size Small Over Longer Distances Integrated Track Clearance Enables Users for Fast and Accurate Bottom and Top Track Installation Over-Molded Housing Helps Maintain Calibration Under Job-Site Conditions Single Lever Power Switch Locks Pendulum in the Off Position Includes Case Number of Beams 3 Number of Planes 0 Number of Dots 3 Number of Lines 0