Our Green Cross Line Laser provides 8+ hours of runtime for all-day brightness and is powered by (4) AA batteries. The high-intensity laser beams allow our users to see the green lines up to 100' for fast and accurate leveling and alignment. The integrated magnetic bracket features amplified rare earth magnets for a stronghold on metal surfaces while the screw and nail hang holes make setup easy and efficient in any environment. Our Green Cross Line Laser is covered by a two-year warranty.