Patent ID: 7318790

Claim:
A revolution counter coupled to a wrist exerciser comprised of a stationary casing and a rotor rotatably arranged inside the case, the revolution counter comprising: a generator module arranged between the rotor and the casing to generate electrical power when the rotor is in rotation; detection means arranged inside the wrist exerciser to detect revolution of the rotor and generate a signal in response to the detection, the detection means being electrically coupled to the generator module to be powered thereby; a wireless transmission module connected to the generator module and the detection means to receive electrical power and the signal therefrom, and comprising means for determining data of revolution per minute and total count of the rotation of the rotor in response to the signal obtained from the detection means, and means for transmitting the data in a wireless manner; and a wireless receiver receiving the data transmitted from the wireless transmission module and coverting the data into a corresponding output signal.