Johnson Level and Tool 40-6580 Dual Grade Laser Large  5 electronic auto-level range. When beyond the leveling range, the laser beam will fl ash, rotation of the beam will stop, and an audible alarm will activate Electronic beam shield to turn the laser beam off in one to three quadrants, when multiple lasers are being used Programmable dual slope operation function allows user to perform slope at different Inclinations in both x and y axis Height of Instrument/Tilt alarm function ensures product accuracy Laser Class IIIa, Power Output 5mW