General inclusion criteria:
- 18 years old or older;
- visited a HCP for treatment of a painful musculoskeletal condition within previous year;
- has usually felt, at least, "mild" musculoskeletal pain on most days of the last 3 months in multiple locations; and
- has felt variable musculoskeletal pain intensity during the last 3 months.
General exclusion criteria:
- past or current employment as a licensed healthcare provider;
- diagnosed with a cardiac arrhythmia;
- has a battery-powered implant in the neck, chest, abdomen, or spine (e.g., pacemaker);
- diagnosed with a neurological condition that causes uncontrolled movement (e.g., Parkinsonism, epilepsy, etc.);
- smokes cigarettes or vapes; (6) has abused substances during the last week; or
- allergic to skin adhesives.