Reduced-Emission Engine Technology Caring for Nature: The STIHL® Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL® Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards. Built-in Cable Strain Relief: Hlps prevent the power cord from becoming accidentally disconnected. Multi-Function Handle: All of the blower’s controls can be adjusted with one hand, allowing simple and reliable operation for both right and left-handed users. In addition, the handle’s control lever allows the user to easily adjust the engine speed.