Split Shaft Power Unit with EM409MP 13" Line Trimmer Attachment Kit (4.0 Ah), Use with up to 13 different attachments, including line trimmers, pole saws, hedge trimmers, blowers and more!. Brushless DC motor. Variable 2-speed push-button control with variable speed trigger enables operator to adjust speed based on different attachments or applications. Active Feedback sensing Technology (AFT) automatically shuts down the tool if there is a sudden drop in rotation speed (e.g. kick-back). Soft start feature gradually increases speed to eliminate start up shock. Constant speed control maintains constant speed under heavy load. Electric brake stops blade 3-5 seconds after trigger is released for increased operator safety. Lever shaft locking system allows operator to quickly and easily switch and secure attachments for minimal downtime. Includes EM409MP 13" Line Trimmer Attachment