Provided is a body-worn instrument that is able to notify a user of a callout or an alert to the user by a means other than an auditory or visual means. This body-worn instrument, which includes an area at least a portion of which contacts the body of a user, has a sensor for detecting a callout or an alert to the user, and a tactile stimulation module that is integrated with the body-worn instrument. The tactile stimulation module reacts to a callout or an alert to the user, and provides a tactile stimulation to the area contacting the body of the user.