Abstract: A combination of modular devices in capsule form adapted to be worn on the person, as with a watchband or belt, for detecting and accumulating the occurrence of specific physiological events and to alert the wearer upon the occurrence of a predetermined number of such events. One embodiment comprises the combination of a motion detecting transducer, an accumulator incremented for 2.sup.n number of movements and a 4-digit light-emitting diode alerting-display module for providing a visual signal that an allowed number of events has occurred. A modified embodiment comprises the combination of a motion detecting transducer, a data accumulator incremented for 2.sup.n number of movements in a selected accumulation interval, and a multi-cell random-access-memory to which the contents of the accumulator are transferred and stored at the termination of each accumulation interval delineated by a timer module, i.e.