This is a DC 12V gear motor. The universal voltage of this motor is DC3V-12V. when you input DC12V, the motor will work at maximum speed. When you input DC6V, the motor will work at half the speed and the torque of the motor will be halved. For example, the rated speed is 12V 10rpm, the 6V voltage is 5rpm, and the 3V voltage is 2.5rpm. It is a tiny and light weight motor.It can be used for landing gears, mechanical arms ,electronic toys, DIY robots, micro motor guide rail equipments and many other devices.It is made of all metal gears, wear-resisting, avoid tooth breaking, so with long woking life. And it used with pure copper wire coil, with low heat and low loss. Thanks for your visit in our store. If there are any question or problem with the motor, please contact us with detail pictures.