Black Decker NST2018 Grass Hog 12-Inch 18-Volt Cordless Electric String Trimmer with 2 Batteries 18-volt, 12-inch cordless string trimmer/edger. Includes two 18V NiCad batteries so you never have to stop half way through your job. Telescoping shaft, centrifugal forces automatically advances line. Patented gear drive transmission amplifies motor torque for increased cutting power and performance. Includes trimmer, 2 batteries, and charger; weighs 6.8 pounds; 2-year warranty.