The 18-Inch 4.0 HP 15.0 Amp chainsaw is a cut above the rest. The WORX exclusive, patented tool-free chain replacement and auto-tensioning system eliminates the headaches faced with most other chain saws. You don't need to be a lumberjack to operate a chainsaw. The auto-tension system includes a single, oversized knob that secures the bar and chain and maintains proper tension during operation--automatically. The WORX auto-tensioning system also works to extend bar and chain life by eliminating any chance of over-tightening. What's more, all-metal dogs at the base of the long, 18-inch bar help add stability during cutting, while an easy-to-lubricate sprocket on the bar nose helps preserve the life of the tool. Powerful enough for your toughest jobs, the WORX electric chain saws produce anywhere from 4.0 peak horsepower. The WORX 18-Inch chainsaw also offers gas-free, hassle-free operation. Different from gas-powered chain saws, our electric chain saw doesn't require you to mix oil and gas or deal with difficult startups. And unlike the competition, the WORX features an automatic oiler that provides constant lubrication to both the bar and chain. Each WORX chain saw is equipped with a 6.75-ounce oil reservoir with an oil level indicator. Designed for Safety and Comfort. The WORX chain saws include a built-in safety chain brake that stops the chain in seconds when improper contact is made, protecting you in the event of kickback. Additionally, a rubber over-molded rear handle and ergonomic full-wrap front handle provide optimum operator control and comfort. FEATURES: The chain mechanism prevents over-tightening and stays at the right tension for hundreds of uses; Install and tighten a replacement chain with no tools; Auto chain lubrication; Low kickback bar and safety chain stop.