This trimmer features a 13-inch cutting swath for increased cutting coverage and an auto-feed head that automatically releases approximately ¼-inch of the line every time you release the trigger for ease of use. The built-in wheels guide the trimmer, creating a beautiful edge around your lawn or walkways. The variable speed trigger provides ultimate user control, from cutting thick grass to more precise trimming around delicate areas. The included HART 20V battery is compatible with all HART 20V tools.