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 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-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 electric chain saws produce anywhere from 3.5 peak horsepower. The 16-Inch chainsaw also offers gas-free, hassle-free operation. Different from gas-powered chain saws, the electric chain saw doesn't require you to mix oil and gas or deal with difficult startups.