The Makita 18V LXT Lithium-Ion Brushless Cordless String Trimmer Kit 4.0 Ah (XRU12SM1) includes a string trimmer, 4 Ah battery and a charger. Integrated automatic torque drive technology helps in shifting RPMs for longer runtime and the Split shaft helps in the storage and transportation of the trimmer. For better power management, the trimmer offers three operating speeds of 4000 RPM, 5000 RPM and 6000 RPM. Bump-and-feed trimmer head works well with 0.08" or 0.095" line and is easy to load. The integrated reverse rotating mechanism prevents the tangling of grass and weeds and clears the head quickly. Extreme Protection technology prevents the accumulation of dust and water. Users preventing overheating, over-discharging and overloading of the battery with Star Protection technology. The kit's ergonomic and compact construction of the trimmer means easy and convenient usage. Rubberized soft grip on the handle minimizes fatigue and ensures user comfort.