The Milwaukee® USB rechargeable green Cross Line Laser is powered by Redlithium™ USB, delivering all day runtime and uncompromised visibility. The high intensity laser beams allow visibility of green lines up to 100 ft for fast and accurate leveling and alignment. The integrated magnetic bracket features micro control that provides a faster set-up and point to point alignment at long distances. The amplified rare earth magnets provide a strong hold onto metal surfaces while the integrated screw and nail hang holes make setup easy and efficient in any environment. The Redlithium™ USB battery can be charged inside the laser via micro USB or swap it out with additional Redlithium™ USB batteries for virtually no downtime. The Milwaukee® USB rechargeable green Cross Line Laser is covered by a two year warranty. Milwaukee® 3521-21 Cordless Self Leveling Cross Line Laser, 100 ft Measuring, +/- 1/8 in at 33 ft Accuracy, 4 V, Redlithium™ USB Rechargeable Battery