Powered by two LXT batteries; x2 LXT technology delivers more power, speed and run time without the hassles of a cord Makita built electronically controlled BL motor delivers 4, 400 RPM for faster and smoother cutting. The BL Brushless motor eliminates carbon brushes, enabling the BL motor to run cooler and more efficiently for longer life Automatic speed change technology adjusts cutting speed and torque during cut for optimum performance x2 LXT technology delivers up to 334 cuts per charge in 2x4 spf and up to 192 cuts per charge in 2x12 spf lumber using two 5.0Ah batteries (batteries not included)