Seeed mini vibration motor 3v 2 0mm circular seeed studio 316040001 p the mini vibration motor from seeed studio operates from 3v dc and vibrates constantly when energised the motor is not sensitive to the polarity of the voltage applied p p seeed provide technical documentation example projects and software libraries on their product pages if you require this information a href http www seeedstudio com depot mini vibration motor 20mm p 2300 html please visit this product s page