Small and cheap DC motor with a gearbox ratio of 1: 120. The gearbox has a reduction in speed, which gives the engine much more power. These engines are ideal for robot platforms, such as robot cars. They fit well with the rubber wheel of 65mm. The motors have an input voltage between 3V and 7.5V, with a higher voltage giving more output. This motor has a return axis on which a rotary encoder can be installed in order to read how the motor moves with high resolution.