The RYOBI 40V HP Brushless 21” Self-Propelled All-Wheel Drive Multi-Blade Mower delivers more power than a 170cc gas mower, making it a true gas replacement. It’s ideal for up to ¾ acre with dual active battery ports and runs for up to 70 minutes with the included (2) 40V 6Ah batteries. Experience the industry’s best 3-in-1 cutting performance with the CROSS CUT™ Multi-Blade System. This allows for less clumping when mulching, further & more even dispersal when side discharging, and when bagging the fine clippings fill from back to front to maximize space for less bag changes. The brushless motor and advanced electronics automatically react to mowing conditions by increasing the blade speed to eliminate bogging down and powering through the toughest cut. As part of WHISPER SERIES™, this mower is 85% quieter than gas, and even quieter than other cordless mowers, allowing you to mow at any time of day. The all-wheel drive system gives you ultimate maneuverability and control in any terrain by providing full power to all four wheels, while SMART TREK™ self-propelled technology allows you to easily adapt the mower’s speed to your pace for less fatigue. When the job is done, the handles quickly and easily collapse for compact, vertical storage. Best of all, it is part of the 40V System – any 40V battery works with any 40V product. This 40V HP Brushless 21” AWD Mower is backed by the 5-year manufacturer’s tool warranty and 3-year manufacturer’s battery warranty.