Nitro tools are built-for pro-level performance. High-efficiency brushless motor is more powerful and runs longer. 15" Dual-exit cutting head trims dense grass along sidewalks driveways and more. Variable speed control lets you choose best for various applications. Switch to ECO mode to save battery power and extend runtime. Bump feed system advances line when you tap on the ground. One-tool charge level indicator. Easy-load spool head simplifies trimming line installation. Line diameter: 0.095". Includes: (2) 4.0Ah Batteries. 4A Dual charger.