DEWALT DW079KI 18-Volt Cordless XRP Self-Leveling Interior Laser Private mode option eliminates remote control interference between multiple rotary lasers on the jobsite Fully automatic horizontal and vertical self leveling with out-of-level shutoff eliminates user error, ensures accuracy, and reduces set-up time Multi-voltage adapter accepts all DEWALT batteries 9.6-volt - 18-volt Protected rotary head and weatherproof design deliver interior and exterior jobsite durability Bright, sharp, high power beam delivers maximum visibility. Laser Class IIIA, Output &lt; 5mW, 630-680 nm