This 48V (24V x 2) 21 - inch Greenworks lawn mower is self - propelled and can climb 21° slopes. Its brushless motor ensures strong power and long runtime. It allows vertical storage, saving 70% space, and has LED headlights for day - and - night use. The 21 - inch steel deck is durable with 7 - position height adjustment, and it features a 4 - in - 1 function, , including rear bag collection, mulching, side discharge, and a turbo button for diverse needs. Moreover, it can cut up to 1/2 of an acre (Run-Time Varies Based on Grass Condition and Operator Technique.). It's 3X quieter than gas mowers. With max blade speeds of 3,250 RPM, it provides cleaner and Environmentally friendly than gas mowers.