The MS-661 CM is a very powerful high-performance saw with advanced 2-MIX technology, STIHL M-Tronic and heated handles. The electronic engine management system regulates the ignition timing and the fuel supply and automatically registers the external temperature for optimal engine performance, great acceleration and sustained maximum torque. The heated handles keep your hands warm and dry for a better grip, making your work safer in winter. Extremely robust and durable with low vibration levels. Designed for professional use within forestry and big timber harvesting.