They look a lot like the yellow all-plastic-gearbox "TT" motors but these have the output-half of the motor gears machined from steel, so they won't strip as easily, and they're twice as slow (and twice as powerful) given their lower gearbox ratio. The metal gears also mean they're louder when running.

You can power these motors with 3VDC up to 6VDC, they'll of course go a little faster at the higher voltages. We grabbed one motor and found these stats when running it from a bench-top supply

• At 3VDC we measured 80mA @ 60 RPM no-load, and 0.5 Amps when stalled
• At 4.5VDC we measured 90mA @ 90 RPM no-load, and 0.8 Amps when stalled
• At 6VDC we measured 100mA @ 120 RPM no-load, and 1.0 Amps when stalled

Note: These are very basic motors, and have no built-in encoders, speed control or positional feedback. Voltage goes in, rotation goes out! There will be variation from motor to motor, so a separate feedback system is required if you need precision movement.

You will need a suitable motor driver to drive this motor as microcontroller cannot drives it directly! Here are some of our recommedation:

• Maker Drive - Vmotor from 2.5V to 9.5VDC, 1.0 A continuous output current per channel, dual channel
• L9110S 0.8A Dual Mini Motor driver

Features:

• Rated Voltage: 3~6V
• Continuous No-Load Current: 100mA +/- 10%
• Min. Operating Speed (3V): 60+/- 10% RPM
• Min. Operating Speed (6V): 120+/- 10% RPM
• Gear Ratio: 1:90
• Body Dimensions: 70 x 22 x 18mm
• Weight: 34.6g