This is a mini vibration motor.
Specifications of vibration motor:
Body Diameter 4 mm [+/- 0.2]
Body Diameter 4 mm [+/- 0.2]
Body Length 8 mm [+/- 0.2]
Ecc. Weight Radius 2 mm [+/- 0.2]
Ecc. Weight Length 3 mm [+/- 0.2]
Rated Operating Voltage 1.5v-3 V
Rated Vibration Speed 14,100 rpm [+/- 3,600]
Typical Rated Operating Current 67 mA
Typical Norm. Amplitude 0.86 G
 
Package includes: 1 piece X 3V vibration motor