SHENZHEN DONGMING MOTOR CO., LTD.
For DC gear motor, the most common voltage is 3v, 6v, 12v and 24v. Certainly this specification is customized. If customer request 3.7v or 18v, that would be no problem.
For some application, energy saving is necessary.
For example, there are electronic lock on Mobike or OFO. Since the motor need last long hours working, so they common request the motor voltage no more than 3.7v.
We can also call 3v dc gear motor low voltage dc gear motor, the most important characteristic is energy saving.