Greenworks 40V 21″ Cordless Brushless Push Mower, 4.0Ah + 2.0Ah USB Batteries and Charger Included

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Power Source Type: Battery Powered
Dual battery ports with automatic switch-over for longer, uninterrupted run-times — when one battery depletes, the mower’s power supply is automatically switched to the second battery. Single lever 7 position height adjustment offers a range of cutting height from 1-3/8 in. to 3-3/4 in