Makita is the innovation leader in brushless motor technology, and the 18V LXT? Lithium-Ion Brushless Cordless 6-1/2? Circular Saw (model XSH03Z, tool only, battery and charger sold separately) combines power and run-time for faster cutting and ripping ? without the cord. The XSH03Z is equipped with Automatic Speed Change? Technology, which adjusts speed and torque during operation for optimum performance. The Makita BL? Brushless Motor is engineered for longer run time, increased power and speed, and longer tool life. The XSH03Z features Extreme Protection Technology (XPT?), engineered for increased dust and water resistance for operation in harsh job site conditions. It?s part of Makita?s expanding 18V Lithium-Ion system, the world?s largest cordless tool system powered by 18V Lithium-Ion slide-style batteries. Makita 18V Lithium-Ion batteries have the fastest charge times in their categories, so they spend more time working and less time sitting on the charger. For improved tool performance and extended battery life, Makita created Star Protection Computer Controls?. Star Protection is communication technology that allows the Star Protection-equipped tool and battery to exchange data in real time and monitor conditions during use to protect against overloading, over-discharging and overheating. For increased versatility, the tool can also be powered by Makita 18V LXT? and Compact Lithium-Ion batteries with the star symbol on the battery indicating Star Protection inside.