The stirrer is available in manual and automatic models, and uses a brushless DC motor for high power output, low vibration and low noise design. The speed is stable, with overheated, overvoltage and overcurrent (overloaded) protection devices. It is possible to manually switch the direction of rotation during stirring, and maintain the stirring speed and torque. Through feedback design, the stirring speed and torque are maintained at any time in response to load changes. The chuck protection device can reduce the risk of accidents caused by improper operation and increase safety. The new chuck is easy to use without the need for a chuck tool. The hollow shaft design allows the stirring bar to be adjusted up and down. The angle of the body can be adjusted to suit special angled stirring.