Makita Model DHR171 is a 17mm cordless rotary hammer powered by 18V LXT Li-ion battery (sold separate). The Makita Brushless motor is precision engineered to be up to 50% more efficient than a comparative model. This means a fully charged 18v lithium-ion battery will last almost twice as long as a product running on a standard motor. Features and Benefits: Brushless motor One touch sliding chuck for easy bit installation and removal. 2-mode operation: Rotary only and Rotary hammer Electric brake Variable speed control by trigger Constant speed control Forward/reverse rotation LED job light Compact and lightweight design Vibration absorbing housing. Includes: Side handle Depth stop.