This study is about creating a special device to help people with *Parkinson's Disease* (PD) who have trouble swallowing, a condition called dysphagia, or problems with drooling. The device is a *wearable sensor*, which means you can wear it on your body. It is designed to help detect when you need to swallow and to improve how you manage saliva. The first part of the study focuses on making the device work longer without charging and making it smaller. The second part involves talking to PD patients to see how easy the device is to use. The third part tests if the device can actually help with swallowing.

• The study is for English-speaking adults, 22 years or older, diagnosed with Parkinson's Disease.
• Participants will need to be in their best medicated state during tests.
• People with certain medical conditions, like severe dementia or recent head/neck surgeries, cannot join.