SKIL PWRCore 40 Brushless 40V 14" String Trimmer Kit with Twist Load and autoPWRJump Charger. The digital brushless motor provides efficient, high-performance power for longer tool life without the hassle of gas. Industry leading PWRCore 40 lithium battery technology wraps each cell with cooling material to keep it powering on for 25% longer run time and 2X battery life. The Twist Load Head allows you to simply insert the line and twist to get started. Dual Line Bump Feed is a fast and hassle-free way to release the line, simply tap the head on a flat surface. All the tools within the SKIL OPE line are a part of the 3-year warranty plus 2 year with registration 5 years.