The Makita 18V X2 (36V) LXT Brushless 6-1/2” plunge Circular saw kit (XPS01Z, tool only, batteries and charger sold separately) delivers precise and more accurate cutting when combined with an optional guide rail system (sold separately). the saw and rail system work together to produce accurate cuts with minimal tear-out. The saw combines a powerful Makita-built Brushless motor powered by two 18V LXT batteries with automatic speed Change technology, which adjusts cutting speed and torque during the cut for optimum performance. The saw has a variable speed control dial (2, 500 – 6, 300 RPM), with soft start and an Electric brake for added convenience. It has a large 2-3/16” cutting capacity at 90 degrees, with a bevel capability of -1° to 48° and positive stops at 22.5° and 45°. when used with a rail system (sold separately) the plunge Circular saw is a more portable option to a Table saw for select applications, and is ideal for use on the job site or in a workshop. 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.