Inclusion Criteria:  Subjects aged 18 to 80 with prolonged post-Covid-19 pain defined by 3 criteria according to the Haute Autorité de Santé :  Symptomatic initial episode of Covid-19 is confirmed by at least one criterion among: PCR SARS-CoV-2 +, antigenic test SARS-CoV-2 +, Serology SARS-CoV-2 +, prolonged anosmia / ageusia of sudden onset , chest scanner Presence of at least one of the initial symptoms, beyond 4 weeks following the onset of the acute phase of the disease  Initial and prolonged symptoms not explained by another diagnosis with no known link to Covid-19  With intact and uninjured skin at the level of the cymba concha of the left ear Signature of informed consent Pain of intensity> or equal to 40 mm / 100mmm on the Visual Analogue Scale (VAS) over the last 7 days before inclusion, analgesic treatment stable for at least 2 weeks Must be able to comply with protocol requirements Beneficiary of a social security scheme or entitled  Exclusion Criteria:  Having a hearing aid device with a left cochlear implant Having a major hearing loss Having an unsuitable ear canal Use of other electrically active medical devices (TENS for chronic pain, pacemaker) Taking analgesic treatment with strong opioids, corticosteroids or non-steroidal anti-inflammatory drugs With cognitive disorders that do not allow answering questionnaires and / or setting up the device Known history of cardiac arrhythmias, atrioventricular block> 1st degree, conduction disorders Symptomatic orthostatic hypotension or history of recurrent vagal syncope History of vagotomy severe asthma Pregnant, breastfeeding or having a desire to become pregnant