JAME, a Wearable Device to Control Tremor

Inclusion Criteria: * Subject signed the approved Informed Consent; * Subject is willing and able to complete the study procedures; * Subject is ≥ 18 years of age; * Subject has a certain diagnosis of: * definite PD, at the start of the disease (respecting the new International Parkinson Disease and Movement Disorder Society diagnostic criteria) and experiences tremor as measured on the UPDRS Part III; or * ET; * Subject has a normal cognitive function (MMSE ≥ 24 or MoCA \>26). Exclusion Criteria: * Atypical parkinsonian syndromes - progressive supranuclear palsy, multiple system atrophy, corticobasal degeneration, dementia with Lewy bodies, vascular Parkinsonism, and other rare causes; * Other pre-existing and active major neurological disease; * Pre-existing and active (e.g., on chronic medication) major psychiatric disease, such as major depression, schizophrenia, bipolar disease; * Advanced liver, kidney, cardiac, or pulmonary disease, cancer; * A terminal medical diagnosis consistent with survival \< 1 year; * Medical implanted devices (e.g. DBS, DUOPATM infusion pump); metal implants; the presence or even a suspicion of metal fragments or moving metal implants in its head or neck, as well as it had prior surgical operations on the head or neck; * Dermatological lesions in the area to be treated with the electrical stimulation; * Major drug dependency, including alcohol (in the investigator's judgment); * Females who are pregnant or lactating; * Subject had an im…