Since noise induced hearing loss is a cumulative disorder resulting from noise exposure over time, any preventive intervention to be effective should lead to a lasting change in exposure level, and may take several years for the preventive effect to be seen. Over the observation period reported on in this study, some persons have withdrawn from the intervention citing difficulties with the equipment and protocols, including interference of the wires with job function, ear discomfort, and the inconvenience of daily downloading. The study is now ongoing, and future studies of this cohort will examine the impact of noise monitoring on rates of hearing loss in the volunteers, as well as the long-term acceptance and perception of usability of the daily noise exposure-monitoring device.