Inclusion Criteria:

• Episodic vomiting that meet criteria for CVS based on the 2025 NASPGHAN guidelines for diagnosis of pediatric CVS
• English-speaking
• Lack of other explanation for vomiting
• Intact external ear that is free of infection or severe dermatological conditions
• Stable stable vital signs for their respective age
• No currently implanted electrical device
• Family able to accurately describe symptoms and number of vomiting episodes
• At least 2 vomiting episodes during the 6 months prior to enrollment

Exclusion Criteria:

• Medically complex children or those who take a medication or suffer from another active disease that explain symptoms
• Children or their parents who have significant developmental delay
• Participants diagnosed with alternate conditions that explains their symptoms after undergoing medical workup per standard of care
• Patients with findings of active disease such as intestinal malrotation, peptic ulcer disease, H.pylori gastritis, celiac disease, inflammatory bowel disease, allergic disorders, hydronephrosis, metabolic disorder or any other active chronic condition or medication that may cause of vomiting
• Patients who are treated with a new drug affecting the central nervous system in the 4 weeks prior to enrollment
• Pregnancy
• Severe cardiopulmonary diseases such as chronic obstructive pulmonary disease (COPD) or coronary artery disease
• Current chronic marijuana use defined as marijuana use > 2 times per week over the last 6 months prior to study enrollment
• Previously treated with a PENFS device