The Essential Tremor (ET) and Parkinson Disease (PD) Tremor Acute Stimulation Study

Inclusion Criteria: * Able to Sign written informed consent in Hebrew. * Patient agrees to attend all treatment procedures and follow-up evaluations and is willing and able to comply with all study requirements. * Patient with a clinical diagnosis of idiopathic PD, or ET for more than 3 years. * Significant tremor for at least one upper limb causing distress or disability. * Patient should be stable on anti-Parkinson's disease or anti-tremor medication for at least one month prior to study enrollment. Exclusion Criteria: * Previous participation in another study with any investigational drug or device within the past 90 days. * Any active implant (cardiac or other). * Current pregnancy or attempting to get pregnant (female patient). * Patient has any major illness or medical condition that in the opinion of the physician would interfere with participation in the study. * Patient with other significant neurological or psychiatric disease other than Parkinson Disease or Essential Tremor. * Patient has any other condition expect for PD and ET that induce tremor. * Patient is treated with drug that may induce tremor. * Patient abuses drugs or alcohol. * Any previous thalamotomy, pallidotomy or patient who has undergone a DBS procedure. * Any anticipated need for surgery during the study. * Any malignancy in the past 2 years. * Patient has confirmation of diagnosis of a terminal illness associated with survival \<12 months.