Prospective Study for Symptomatic Relief of ET With Cala Therapy

Inclusion Criteria: * Must be ≥22 years of age * Competent and willing to provide written, informed consent to participate in the study * A diagnosis of essential tremor as confirmed from clinical history and examination by a movement disorder neurologist * A tremor severity score of 2 or above in the dominant hand/arm as measured by any one of the TETRAS upper limb items and a minimum subset score of 6 across all upper limb items * Significant disability due to essential tremor (Bain \& Findley score of 3 or above in any one of the upper limb items and a minimum subset score of 8 across all upper limb items) * Stable dose of tremor medications, if applicable, for 30 days prior to study entry * Stable dose of antidepressant medications, if applicable, for 90 days prior to study entry * Willing to comply with study protocol requirements including: * remaining on a stable dosage of tremor and antidepressant medications, if applicable, during the duration of the study * no significant alcohol or caffeine consumption within 8 hours prior to study visits * no usage of the Cala TWO device within 8 hours prior to study visits Exclusion Criteria: * Moderate to severe ethanol dependence as defined by the criteria outlined in the DSM-5 (score of 4 or higher) * Implanted electrical medical device, such as a pacemaker, defibrillator, or deep brain stimulator, or implanted metal in the wrist to be stimulated * Previous thalamotomy procedure, including stereotactic thalamotomy, g…