The new ECHO DCS-3500 is more than your average battery chain saw. It's been designed exclusively for use by professionals and domestic enthusiasts. The advanced brushless motor generates power equivalent to a 35 - 40 cm³ petrol engine , whilst being quiet, producing 0 emissions and very low vibrations. Compatible with ECHO's 50V 2Ah and 4Ah batteries, you get long run times and fast charging. | ECHO Global