The GMS210 82-volt 21” self-propelled, rear-wheel-drive mower delivers the power and performance needed for all-day use. Featuring our SmartCut™ Technology, the mower detects high or dense grass, and delivers more power to maintain consistent cutting performance. With our multi-function 3-in-1 design for bagging, mulching, or side discharge; a steel deck; and seven cutting heights, this mower works hard. Plus, dual battery ports provide longer, uninterrupted runtimes — when one battery depletes, the mower’s power supply is automatically switched to the second battery.