The apparatus has a piezoelectric element for outputting an acoustic signal. It also has an alternating voltage unit (V) for outputting an alternating voltage which is supplied to the piezoelectric element. A voltage detection element (E) detects a voltage...

A body motion detector, to be attached to or carried by a user for detecting body motions of the user, uses a plurality of sensors each for detecting body motions in a specified direction to output a body motion signal according to the user's body motion. ...

A pedometer determines that the user does not wear the pedometer when the current number of steps is not more than a prescribed set value, not to employ the data of the current number of steps on the day the user does not wear the pedometer for calculating...