Miniature DC geared motor is a motor. After power is applied, the speed will be at least several hundred rpm, and the high speed will be tens of thousands. In this case, the torque of the motor is very small, and it cannot carry heavy things. A reducer is needed. The miniature DC motor plus the reducer is called a miniature DC geared motor. This motor can reduce the speed to tens to a few tenths of a revolution per minute, which can be arbitrarily adjusted and has a large torque. For a popular example, an electric razor requires only a micro DC motor. Its requirements are exactly fast speed and low torque. For some lifting equipment, such as the automatic lifting device of the projector, its requirements are low speed and large torque. You must choose a geared motor.