A high-capacity environmentally-friendly mower that can actually pay for itself in fuel savings! No gas, oil, tune-ups - and NO annoying loud-mower noise. In our tests, we were very impressed with the cutting power; thick grass 4-5" tall didn't bog it down substantially - even in mulching mode. Patented rechargeable battery technology extends no-load run-time to over 4 hours - 2-3 times that of other cordless mowers - practical for use on lawns up to 1/2 acre/22,000 sq ft. Battery service-life is affected by factors such as number of charge/discharge cycles, charging procedure, proper maintenance and others; typical battery service-life of 3-5 years (battery is owner-replaceable and currently retails for $90.00; follow Operating Manual instructions to achieve maximum battery life). Removable safety key disables mower against accidental/unintentional operation. Smooth-rolling 7" front and 9" rear rubber - not plastic - wheels; mower weighs less-than 100 lbs for easy maneuverability. One-touch 7-position height adjustment, folding handle for compact storage. Includes UL-listed 110-volt AC charger (10-12 hours for full charge.) Ships UPS/FedEx partially assembled (just attach handle.) Manufacturer's 3-year parts and labor warranty.