Key Inclusion Criteria:  Subject is 22 to 75 years of age, inclusive  Subject has a diagnosis of primary FM as defined by the 2016 American College of Rheumatology Preliminary Diagnostic Criteria for FM, which requires satisfaction of the following criteria:  Widespread pain index (WPI) ≥7 and symptom severity (SS) scale score ≥5, OR WPI 4-6 and SS scale score ≥9; Symptoms have been present at a similar level for at least 3 months; Pain must be present in at least 4 out of 5 body regions Subject with ongoing treatments should be on stable therapy for 30 days prior to screening appointment. Subject is capable of reading and understanding English and has provided written informed consent to participate.  Key Exclusion Criteria:  Lifetime history of bipolar disorder as assessed by the MINI. Current, untreated, major depressive episode and/or anxiety disorders as assessed by the MINI. Subject has a BDI-II total score > 25 at either the Screening appointment or Baseline appointment. The subject is at increased risk of suicide on the basis of the investigator's judgment, a response > 1 to BDI item #9, or the results of the Columbia-Suicide Severity Rating Scale ("C-SSRS") conducted at Screening or Baseline (i.e., any suicidal behavior during the preceding year or C-SSRS Type 3, 4, or 5 suicidal ideation during the preceding year). Subject has any other disease or medical condition that, in the opinion of the Investigator or Sponsor, could endanger the subject, interfere with the evaluation of the study device's efficacy or safety, or compromise the subject's ability to comply with/complete the study.