The diameter of the rotor is only 2.2mm, with varistor, and with a double vibrating head, the workmanship is very delicateMotor specifications: 3*4* MM (minimum rotor motor)Motor length: 6.6 MM (without eccentric)Voltage: 1.5 V, current: 0.07 AVoltage: 2 V, current: 0.09 AVoltage: 3 V, current: 0.13 AIt vibrates more powerfully at 3V than at 1.5V, but it is also relatively prone to heat.Package includes: 1 piece of motorThe product will be upgraded constantly, the appearance and color may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance.