Abstract: A personal memory aid device and a pressure sensitive transducer which are both adapted to be worn at differing locations on an operator for the purpose of conveniently registering desired events. Actuation of the pressure transducer, either by a simple motion of the operator or by contact of the operator with another object, causes storage of information, such as an event count, concerning the an event defined by such actuation to be stored for concurrent or later communication to the operator. Wired and microwave links are provided for signalling between the transducer unit and the housing. A preferred embodiment is arranged to be implemented in combination with timekeeping circuitry and to be worn on the wrist of the operator in the manner of a wrist watch. The memory aid device is particularly adapted for use during athletic activity by the provision of a waterproof case.