The N20 3V 50RPM Micro Metal Gear Motor with Encoder is designed for 3V operation but can also run within a voltage range, starting from as low as 0.5V. While lower voltages may not be practical, higher voltages could reduce the motor's lifespan.
These motors come in various gear ratios, from 5:1 to 1000:1. Except for the 1000:1 version, all models have the same physical dimensions, making it easy to swap them to accommodate changing design needs.