Parkinson disease a person with parkinson disease in stage of losing ability of speaking. Is there any device that may help the person to be able to communicate? I don't have much information about his symptoms since I've not seen him for a long time, but

See a specialist. Advanced parkinson's disease can be hall engine. Work with a specialist in this area.
Speech. Speech may improve by simply adjusting his pd medications. There is also a specialized form of speech therapy called lsvt, proven effective. Singapore has excellent movement disorders specialists. He should consider seeing one, such as dr. Erle lim.