The Kobalt 40-Volt Max Brushless motor String Trimmer Kit tackles the toughest weeds. The string trimmer's 15 inch cutting swath and dual side bump head makes it easy to advance line for continuous use. Variable-speed trigger allows you to set the power to suit the task for maximum control. The included 4.0 Ah battery and charger are compatible with all Kobalt 40-volt max tools and are backed by a 5-year limited warranty on the tool and a 3-year limited warranty on the battery and charger.