DC Motor, low speed gear motor, 3-18 Volt (Also a generator)

Product Description

This motor operates with any voltage from 3 V up to 18 V. The speed depends on the operating voltage. At 3 volts the speed is 120 RPM. Each additional volt increases the speed by 40 RPM. The exposed shaft is 4 mm in diameter and 10 mm long. The speed reduction mechanism in this motor is a planetary gear box. 
Overall length: 66.5 mm 
Diameter: 24 mm max 
Connection wires: 20 cm long 
Rated voltage: 5V - 18V 
Operating voltage: 3V - 18V 
Condition: Used 
Warranty: 90 days 
Other features: Contain strong magnets and can operate as an electric generator.

Table below shows the relation between the input voltage and the rotation speed (Rounds Per Minute)