WORX WG304.1 Chain Saw 18-Inch 4 15.0 Amp 15.0 Amp motor output delivers a more powerful cutting performance to the extended, 18-inch bar Patented auto-tension chain system prevents over-tightening; stays at the right tension for hundreds of uses Low kickback bar and built-in chain brake for added safety; Chain Links : 63 Automatic oil lubrication and built-in oil reservoir with window level indicator. Oil Tank Capacity : 200 ml Comes fully assembled right out of the box, and includes 3-year manufacturers warranty Note: Please refer user manual below for better use which is highly recommended.