This study is testing a new way to help people with Parkinson's disease, a condition that affects movement. The study uses a safe and gentle device called Sphere V3.0 that sends tiny electrical signals to the brain through the scalp. Participants will use this device at home for 13 minutes every weekday for 3 weeks and then be checked for 3 more weeks without using the device. The whole study lasts 6 weeks and is done through video calls and online checks.

Researchers will look to see if the device helps with movement problems like shaking, stiffness, or slow movements. They'll also check if these improvements last after stopping the device and if there are any side effects.

• The study lasts 6 weeks, with device use only in the first 3 weeks.
• Participants need to record videos of their movements using a smartphone or computer.
• All participants receive the active treatment; there is no fake treatment group.