Electric lawn mower series bosch rotak cutting width 40 cm max lawn area 400 m min cutting height 20 mm max cutting height 70 mm cutting height steps 9 positions power hp 23 hp power watt 1 700 watt discharge rear discharge grass box capacity 50 litres front wheel diameter 150 mm rear wheel diameter 170 mm start system electric start features central cutting height adjustment safety features overload protection operator presence control eng