Electric lawn mower series bosch rotak cutting width 43 cm max lawn area 800 m min cutting height 20 mm max cutting height 70 mm cutting height steps 10 positions rotational speed 3 600 rpm power hp 245 hp power watt 1 800 watt discharge rear discharge grass box capacity 50 litres start system electric start features central cutting height adjustment height adjustable handle safety features operator presence control engine stop blade brake