This motor operates from 6V. Of cause the lower the volts the lower the RPM.
High Torque 370 Motor DC Features:
*Outer diameter of motor: 24.3mm, the height of motor: 30.7mm
*diameter of output axis: 2mm, length of output axis: 12.5mm
*screw: M3, the distance of screw hole: 17mm
6v, rotating speed: 5000rpm, current: 0.06A