80V 21" Cordless Battery 4-in-1 Self-Propelled Lawn Mower w/ 4.0Ah, 3.5Ah Battery & Rapid Charger. 4-in-1 System: Mulch, Bag, Side Discharge, Turbo Leaf Pickup. Dual battery ports with Auto Switch™ technology - 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 heights to meet your specific needs. Push Button Start - Press and mow, no more cord yanking