In tests conducted by the Hammacher Schlemmer Institute, this trimmer was rated best for its superior trimming ability and ease of use. Delivering more power than all the other electric trimmers tested, this model's motor rotates a 10-inch nylon string at a high rate of speed, cutting through thick, heavy grass, leaves and weeds effortlessly. Also, a 12-volt battery allows the trimmer to groom yards as large as 3/4 of a mile on a one hour charge. The trimmer's 58-inch long frame makes it simple to reach in and clear beneath trees and around shrubbery. The trimmer is designed with a handle that lets you adjust the tool's balance, helping relieve stress on your hand and provide comfort during use. Includes a wall station which holds the unit and charges the battery when not in use. replacement spools snap on easily. 58" H x 10" W x 10" D. (10 lbs.)