Robot lawn mower series robomow rx cutting width 18 cm max lawn area 250 m min cutting height 15 mm max cutting height 45 mm battery capacity 7 ah type of battery lead battery life 120 minutes charging time 1 200 min number of batteries 1 antriebsfunktion single speed max steigung 15 safety features lift sensor engine stop blade brake touch sensor incline sensor power supply battery monatlicher stromverbrauch 25 kwh schallleistungspegel