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These tiny, high-quality motors are intended for use at 6V. Although, in general, these kinds of motors can run at voltages above and below this nominal voltage, so they should comfortably operate in the 3 – 9V range (rotation can start at voltages as low as 0.5V). Lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor.
The micro metal gearmotors are available in a wide range of gear ratios—from 5:1 up to 1000:1—and offer a choice between two different motors: high-power (HP) and standard. With the exception of the 1000:1 gear ratio versions, all of the micro metal gearmotors have the same physical dimensions, so one version can be easily swapped for another if your design requirements change.