The proposed study will involve a comparison of 2 types of communication devices that are approved for use in individuals with communication disorders. One of the devices, the voice amplifier, is frequently prescribed for individuals with Parkinson's disease and should be considered as part of the standard care for the symptom of low speech intensity in this disorder. The other device is frequently prescribed for individuals with hearing impairment (unrelated to Parkinson's disease) but is not considered to be part of the standard of care for individuals with Parkinson's disease. This clinical study will use a crossover design in which the participants will receive both devices, one after the other, and the order will be randomized across the individuals. There is no control group or placebo.