Abstract: A voice-controlled timing and calculating device includes a microphone to receive a user's vocal signal, a voice amplifier amplifying the vocal signal, a comparison circuit comparing the vocal signal with information stored in a memory to retrieve an associated instruction, a processor performing the instruction of serving as a timer or a calculator to generate a result, and a voice synthesizer which converts the result from the processor into a synthetic voice which is then broadcast by a speaker so that the device may be operated with vocal input and vocal output. Further, the device may be provided with visual display to show the result of the processor. Also, a manually actuateable switch may be provided to allow a user to alternatively switch the processor between the timer and the calculator.

Abstract: An exercising hula hoop device includes a hoop body inside which a control circuit is arranged. The control circuit has a processor having the functions of rotation counting and timing so that the number of rotations of the hula hoop and the time period of use may be calculated and stored in a memory. Output devices, including visual display and audio sound generators, are provided to display the counting and timing result from the processor. Switches or keys are also provided for the hula hoop user to select the desired mode of operation and to key in the user's body information, based upon which the processor may calculate the calories consumed in using the hula hoop device. A music playing device is also incorporated in the control circuit to play one or more pre-selected rhythms so that the hula hoop user may enjoy music during use of the hula hoop. The speed of music played may correspond to the rotational speed of the hula hoop.