Cordless lawn trimmer electric lawn trimmer series ryobi rlt cutting system line line cutting width 300 mm line feed automatic thread thickness 16 mm battery voltage 18 v type of battery li ion number of batteries with 1 battery battery capacity 15 ah charging time 1 h power 250 watt rotations per minute 9 000 rpm handle shape loop handle adjustable additional handle tilting cutter head telescopic handle max spl 843 db max sound power level