The RYOBI 40V HP Brushless 21" Self-Propelled Multi-Blade Mower delivers more power than a 170cc gas mower. It’s ideal for up to ¾ acre with dual active battery ports and runs for up to 70 minutes using (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. The SMART TREK™ adaptive variable speed self-propelled technology allows you to effortlessly adapt the mower's speed to your pace, so you can finish the job quickly, effortlessly, and for less fatigue. The handles quickly and easily collapse for compact, vertical storage. Best of all, it is part of the RYOBI 40V system where any 40V battery works with any 40V product. This 40V HP Brushless 21" Self-Propelled Multi-Blade Mower is backed by the 5-year manufacturer’s tool warranty and includes the RY401015 40V HP Brushless 21” Self-Propelled Multi-Blade Mower, Grass Catcher Bag, Start Key, Mulch Plug, Side Discharge Chute, and Operator's Manual. Battery & charger not included.