Ryobi RY40220 40V Cordless Lithium-Ion 13 in. Expand-It X String Trimmer Expand-It system accepts universal outdoor attachements Gas-like power in a cordless powerhouse REEL-EASY bump feed string head for fast and easy reloading Variable speed trigger allows matching speed to the application prolonging battery life Versatile 13 - 15 in. adjustable cutting width