DFRobot Metal DC Geared Motor w/Encoder - 6V 210RPM 10Kg. cm (FIT0521)Introductionthis is a metal geared dc motor w encoder. It is a 6vmotor with a 34: 1 metal gearbox and an integrated quadrature encoder thatprovides a resolution of 11 counts per revolution of the motor shaft, whichcorresponds to 341. 2 counts per revolution of the gearbox's output shaft. These units have an 8 mm length, 4mm diameter d shaped output shaft. This motor is intended for use at 6v, thoughthe motor can begin rotating at voltages as low as