The RYOBI 18V ONE+ HP String Trimmer sets the bar for high performance and advance technology. Simply insert the 18V battery and pull the trigger to start. The premium HP brushless motor provides more power, longer runtime, and a longer motor life. This auto-feed trimmer gives the user all the power they would expect from a bump feed head, without the hassle of bumping. With the press of a button the shaft rotates so you can easily tackle any edging jobs. The variable speed trigger and 2-speed switch deliver increased control for any application. The adjustable 11 in. to 13 in. cutting width allows you to optimize your trimmer for increased runtime or increased productivity. This trimmer is also equipped with a 4.0 Ah battery and charger that are compatible with over 175 RYOBI 18V products.