This proposed study is a worksite intervention trial of a new technology to reduce occupational noise-induced hearing loss. The intervention will test the effectiveness of a noise exposure dosimeter, the QuietDose - essentially a small microphone connected to a noise logging device about the size of a beeper- that measures a worker's daily noise "dose", as well as peak noise exposure, inside of the worker's hearing protectors. Workers and the study coordinator receive daily feedback about noise exposures (if the device was used outside of the study it would be safety personnel that received the feedback outside of the workers themselves). Such feedback will allow steps to be taken to minimize such exposures, such as behavioral adjustments and improved awarenessThe goal of this study is to determine whether daily assessment and feedback of workers' noise exposures leads to more effective use of hearing protection and prevention of noise-induced hearing loss. The proposed study will take advantage of the unique working relationship between a research institution (the Yale Occupational and Environmental Medicine Program) and a major industrial corporation (Alcoa, Inc.) to conduct this intervention trial at several of the company's facilities.