One touch sliding chuck for easy bit installation and removal. Easy to operate operation-mode change lever. Located on the top of the motor housing for reduced possibility of breakage. "Soft no load" function automatically reduces the motor speed during idling to suppress the vibration of the machine body. Unrivalled low level of vibration aided by vibration absorbing housing. LED service light indicates when to replace carbon brush. In hammering mode, on/off switch is switchable between two switches to meet your application: For Continuous or Intermittent chiseling applications.