The Senix 4QL backpack leaf blower features a 4-cycle engine that does not require mixing gas and oil, is lightweight, and provides the power to clear heavier debris. Four-cycle engine has lower emission and is more environmentally friendly than 2-cycle. The powerful 49 cc, 4-cycle engine delivers 600 CFM/ 200 MPH and 18N blowing force to easily clear wet, heavy leaves, grass and other debris. Variable Speed, Cruise Control, 18N Blowing Force. Variable-speed throttle allows you to tackle a variety of jobs, and cruise control maintains your desired speed for extended use. Backpack gas leaf blower is ideal for year-round cleanup for homeowners and small businesses with 1/2 to 1 acre yards. All Senix 4QL gas powered products are backed by our 3-year limited warranty for your peace of mind.