This gearmotor consists of a low-power, 6 V brushed DC motor combined with a 4.4:1 metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25 mm, and the D-shaped output shaft is 4 mm in diameter and extends 12.5 mm from the face plate of the gearbox.
Key specs at 6V: 1300 RPM and 250 mA (max) free-run, 8 oz-in (0.6 kg-cm) and 2.4 A stall.