The DEWALT DCM571 FlexVolt XR Trimmer is fitted with a highly efficient brushless motor with a metal housing for increased runtime, life, durability and efficiency. The variable speed control provides a high/low setting for fast job completion over large areas. The enclosed and durable Xenoy battery housing provides increased protection. Includes a brush cutter adaptor kit and a brush knife, for everything from simple grass trimming to heavy-duty clearing work. DCM571X1: 1 x 18/54V 9.0/3.0Ah Li-Ion BatteryDCM571N: Bare Unit, No Battery or Charger. The DEWALT DCM571X1 FlexVolt XR Trimmer is supplied with: 1 x 18/54 Volt 9.0/3.0Ah Li-Ion Battery1 x 8 Amp Li-Ion Charger1 x Shoulder Strap1 x Trimmer Line 2mm x 7.5m DEWALT FlexVolt XR batteries stand at the forefront of cordless technology. They are the worlds first convertible 18/54 Volt batteries, offering unprecedented levels of power. Provides the unique ability to power heavy-duty construction power tools whilst still being compatible with existing DEWALT XR 18 Volt products and offering increased runtime. No Load Run time with Line = 54 mins (Low Speed), 44 mins (High Speed), using a 54 Volt 3.0Ah Li-Ion battery.