This is the first hand-held trimmer to use a standard 16.4-ounce propane canister as its power source. This product is environmentally friendly with zero evaporative emissions and uses 96 percent fewer carcinogens exceeding the 2011 EPA emissions standards. Other benefits of this product include: no messy mixing or oil and gas, no winterizing, lower maintenance and fuel costs. Standard propane containers are also readily available. Learn more at golehr.com.