M18 Fuel String Trimmer, Powerstate Brushless Motor Delivers More Power Under Load & Longer Motor Life, Redlink Plus Intelligence Provides Optimized Performance & Overload Protection Using Total System Communication Between Tool, Battery & Charger, Redlithium High Demand 9.0 Battery Delivers Unmatched Run Time, Power, & Longer Life, Not Included, 14" - 16" Cutting Swath, .080"-.095" Line Diameter, 0-4,600, 0-5,800 RPM Variable Speed Trigger, Bump Feed System.