A magnetic position sensor wheel for an angular position transducer of an electric motor is provided which includes a hub with a flange, a first ring of magnetic material disposed on one side of the flange between a hub axis and an outer periphery of the flange, and a second ring of magnetic material extending axially along the outer periphery of the flange. The toothbrush further includes a drive assembly which includes a DC motor having a rotating output shaft and a mounting assembly for flexibly mounting the motor to the handle. The linkage includes a swing rod connected fixedly to the output gear, and a link connected pivotally to the swing rod. This structural feature results in a highly active complex, which generates high molecular weight polymers with unique microstructures. This magnetic recording medium can achieve an excellent block error rate, which cannot be realized with magnetic recording media comprising conventional acicular magnetic powders. An individual authenticating unit 11 having an identity authenticating function performs identity authentication based on a card ID 9 of a credit card CC being used by a user P when purchasing an item and based on a personal ID 10 of the user P, thereby preventing unauthorized use of the credit card.