The main purpose of this product is to remind the user that the exercise time and calories burned, and, indeed, to achieve the estimated exercise effect and complete the fitness goal. The product relates to a detection device, mainly containing electrically connected to the control unit and the sensor unit. (Figure) The control unit includes a receiving apparatus system, display device and alarm device. The receiving means of the standard system can be set to the amount of exercise, and the sensor unit to receive the sensed data, and displayed on the display device. If the receiving means less than the estimated goal, the warning device alerts the user. The system control unit can control the opening and closing of the sensor unit. Also, the turn-on time in accordance with the control unit as a sensor unit sensing the presence of the determined amount of motion. The sensor unit system can be installed on rope skipping, hula hoops, dumbbells, sit-up device, or even the human body.