The Milwaukee 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 levelling 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. This kit includes the CLL-C Green Cross Line Laser, a track clip, four AA batteries and a carrying case.