DEWALT DW089K Self-Leveling 3-Beam Line Laser 3 Beam Line Laser to aid in 90-Degree layout, built-in magnetic pivot bracket 2x Brighter diode to increase visibility in bright job site conditions Accurate to +/- 1/8-Inch at 30-Feet for level applications 1-button operation and control panel for ease of use Range 50 feet, range with detector, 4 AA batteries for 30 hours of run-time