Johnson Level 40-6683 Self-Leveling Combination 3 Line or 3 Beam Laser Dot Projects three lines or three dots Locking mechanism protects inner pendulum during transportation Manual mode allows unit to tilt at extreme angles Self-leveling with visual and audible alarms when beyond leveling range Laser Class Illa, &lt;5mW Laser Class llla Power output Less/Equal to 5mW 3 Year Warranty: Johnson Level warrants this product against defects in material and workmanship for three years after the confirmed purchase date. At its option, the company will replace or repair the product if it fails under normal use.