BLACK+DECKER LSTE523 Li-On String Trimmer Converts from trimmer to wheeled edger Power Drive Transmission for increased torque 2-speed control for more power or extended runtime. Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18 EASYFEED allows you to advance your line with the push of a button with no bumping required Part of the 20V MAX System; 1 System - Endless Tasks. Power for your Style Part of the POWERCOMMAND Family of tools  EASYFEED, POWERCUT, POWERBOOST - helps solve common user frustrations when using Outdoor Power Equipment