BLACK+DECKER 12-Inch Grass Hog Automatic Feed String Trimmer Edger with Auto Feed Spool GH400 Automatic Feed Spool (AFS) releases line as needed-no bumping required Powerful 4.3 amp motor for superior trimming performance in heavy weeds and grass Groom'N'Edge button rotates 180-degrees for convert from trimming to edging Edge guide for precise trimming and edging 30 day no-risk satisfaction guarantee and full two-year warranty