The Makita DTM51 has been developed based on the models BTM50 and equipped with the tool-less accessory change system. Tool-less accessory clamp. Lever style lock system allows for quick installation and replacement of accessories. Ergonomically best possible barrel grip, with a perfect circumference size and shape which fits the hand for extra comfortable handling. Battery capacity warning lamp Blinking red; battery power has been nearly used up. Solid red; battery power has been used up (battery protector will shut off the power.). Accessories can be installed at 30 increments, across 360 degrees. Variable speed control dial. Soft start. Anti-restart function. High operating efficiency.