Designed for performance and comfortable use the WORX 12" electric grass trimmer is the perfect blend of comfort control and versatility. It utilizes a telescoping shaft that extends up to eight extra inches minimizing the backbreaking labor from trimming. The shaft also rotates 180 degrees to convert the trimmer to an edger. A balanced design promotes natural body posture. This means maximum comfort and minimum fatigue even during prolonged operation. The adjustable handle created a comfortable position for less fatigue to the forearms. There is a pull out guard to help protect vegatation and lawn ornaments from damage. The dual-line feed features a unique auto-feed trimmer line system so you'll never have to tap or bump your trimmer to feed additional line. The auto-feed ensures you have the perfect amount of line at all times. The WORX trimmer line is made from a patented copolymer nylon resin and syntheic material. It is designed with an oval aerodynamic shape to increase trimming and edging life up to 25% compared to normal use conditions. This patented resin line allows for the line to stretch and cushion on impact with hard surfaces.