Inclusion Criteria:  Must be ≥22 years of age Competent and willing to provide written, informed consent to participate in the study  Clinically significant postural tremor as defined by:  Dominant hand/arm exhibiting postural tremor ≥ 2 (while in the off state) as assessed by the MDS-UPDRS postural tremor score Stable dose of Parkinson's disease medications, if applicable, for 30 days prior to study entry  Willing to comply with study protocol requirements including:  Having the ability to do telemedicine or video calls for study visits remaining on a stable dosage of Parkinson's medications, if applicable, during the duration of the study no significant caffeine consumption within 8 hours of study visits  Exclusion Criteria:  Implanted electrical medical device, such as a pacemaker, defibrillator, or deep brain stimulator Suspected or diagnosed epilepsy or other seizure disorder Swollen, infected, inflamed areas, or skin eruptions, open wounds, or cancerous lesions of skin at stimulation site Peripheral neuropathy affecting the tested upper extremity Presence of any other neurodegenerative disease or dementia. These may include: multisystem atrophy, progressive supranuclear palsy, dementia with Lewy bodies, and Alzheimer's disease. Botulinum toxin injection for hand tremor within 6 months prior to study enrollment Are participating or have participated in another interventional clinical trial in the last 30 days which may confound the results of this study, unless approved by the Sponsor Significant caffeine consumption within 8 hours of study enrollment, which may confound the results of the study, where significant caffeine is considered more than 95 mg (equivalent to a cup of coffee). Subjects unable to communicate with the investigator and staff Any health condition that in the investigator's opinion should preclude participation in this study Pregnancy or anticipated pregnancy during the course of the study