The Worx 16 In. 3.5 HP 14.5 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 . 16 In. 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 3.5 peak horsepower. The Worx 16 In. 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 Oz. 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.