Runtime Extension Technology with dual mode accelerator switches for high performance or longer run time. Patented PowerDrive Transmission™ prevents bogging down in heavy grass and weeds. The Automatic Feed Spool™ ensures continuous work without bumping and having to stop to adjust the spool. Includes a wheeled edging feature- just rotate to convert from trimmer to edger. It is quiet and easy to start, delivering great cutting results without the mess and hassles of gas powered trimmers. The adjustable height and pivoting handle positions provide maximum comfort and control. Part of the 20V Max System - A System that Demands Attention (1 Battery fits multiple tools). 20V Max voltage, 18V nominal voltage under normal cutting conditions in run time mode.