Enter the 40V System with the RYOBI 40V HP Brushless 21" CROSS-CUT™️ Self-Propelled Lawn Mower. 40V HP Technology delivers more power than a 170cc gas mower, and this mower is designed to tackle up to ¾ acre with ease. Dual active battery ports and two included 40V 6Ah lithium batteries give you up to 70 minutes of runtime. The CROSS CUT™ Multi-Blade System delivers a superior cut, producing the industry’s best bagging, mulching, and side discharge. 40V HP technology combines a brushless motor, advanced electronics, and lithium batteries that automatically react to mowing conditions by increasing the blade speed to eliminate bogging down and power 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 and with less fatigue. Best of all, it is part of the RYOBI 40V system where any 40V battery works with any 40V product. And with the 5-year manufacturer’s tool warranty and 3-year manufacturer’s battery warranty, you can trust in its performance for years to come. This mower kit includes the RY401015 40V HP Brushless 21" CROSS-CUT™️ Self-Propelled Lawn Mower, (2) OP40605 40V 6Ah Lithium Batteries, OP406 40V Rapid Charger, Grass Catcher Bag, Start Key, Mulch Plug, Side Discharge Chute, and Operator's Manuals.