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 noi se. There are three 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: 100RPM, 200RPM, 2000RPM(Optional) Output Shaft Diameter: 3mm / 0.12" Output Shaft Length: 20mm / 0.78" No Load Rated Load Stalling Speed(RPM) Current(A) Speed(RPM) Current(A) Torque(KG.CM) Torque(KG.CM) Current(A) 100 0.04 80 0.07 2 16 1 200 0.02 160 0.04 1 17 1 2000 0.02 1600 0.06 0.12 1 0.35 Package Includes: 1 x Gear Motor Note: There might be 10% speed error. Thanks for your understanding.