Solaris SP21HB 21-Inch 24-Volt Cordless Self-Propelled FWD Bag/Mulch/Side Discharge Cordless Lawn Mower (Discontinued by Manufacturer) Front Wheel Drive Self Propelled Most advanced electric motor technology equals more power and longer run times Removable Batteries (With On board and Off board charging options) Push Button Start With LED Battery Level Indicator 7 position height adjustment from 1.5-inch to 3.5-inch