Features: A gear motor is a specific type of electrical motor that is designed to produce high torque. Gear motors are primarily used to reduce speed in a series of gears, which in turn creates more torque. Full metal gears would ensure a longer service life, high torque and less noise. There are five reduction gear motors of different speed and you can choose the one you need. Gear motors can be found in many different applications, and are probably used in many devices in your home. Specifications: Voltage: DC 12V Speed: 15RPM, 30RPM, 50RPM, 100RPM, 200RPM(Optional) Outer Diameter: 20mm / 0.78" No Load Stalling Speed(RPM) Current(mA) Torque(KG.CM) Current(A) Reduction Ratio Gear Box Length(mm) 15 25 4.9 3.3 671 20.5 30 40 8.1 0.68 382 20.5 50 -- -- -- -- -- 100 22 6.7 0.61 100 18.5 200 65 6.1 0.65 41.5 17 Package Includes: 1 x Gear Motor 1A gear motor is a specific type of electrical motor that is designed to produce high torque 2Gear motors are primarily used to reduce speed in a series of gears, which in turn creates more torque 3Full metal gears would ensure a longer service life, high torque and less noise 4There are five reduction gear motors of different speed and you can choose the one you need 5Gear motors can be found in many different applications, and are probably used in many devices in your home