STIHL RMA 510 V 21 in. 36 V Battery Self Propelled Lawn Mower Kit (Battery & Charger) Roll Out Drawer The extended Runtime blade provides The extended Runtime blade provides an optimal balance of cut quality and runtime for all around performance WaterSense certified: meets EPA WaterSense criteria to conserve water without sacrificing performance allowing the user to choose a mowing speed between 0 36 V Battery Self Propelled Feature 10 Text Feature 1 Text Self propelled with variable speed drive a squee Feature 2 Text Brushless electric motor with ECO mode the motor Feature 3 Text Zero or low exhaust emissions Feature 4 Text Mower can be stowed in three positions: folded or Feature 5 Text Locking key key prevents accidental starting of Feature 6 Text No gradual drop in power