The world's first power regulator with a power load. This patent pending technology solves one of the biggest pain points of string trimmer. Replacing your string is just as simple as feeding the line to the head and pressing a button. The new EGO POWER + 15 "POWERLOAD" string trimmer has a carbon fiber shaft that is stronger than any other string trimmer on the market today. The shaft is equipped with lifetime warranty, so the strength and durability assurance will last forever. The revolutionary trimmer also builds an efficient brushless motor, bump feeder propulsion,.095 "professional cutting line, and compatible with all EGO ARC lithium batteries to maximize the convenience of cordless and power transmission beyond belief.