Inclusion Criteria:  Men or women between 18 to 50 years of age. Subject able to receive and understand information related to the study and give written informed consent. Subject is a non-smoker or an ex-smoker (stopped smoking for at least 6 months). Subject demographics include a range of dark skin pigmentations, including at least 30% of the total pool, assessed by phototypes V and VI according to the Fitzpatrick scale (Questionnaire score between 28 and 40). Subject is healthy (assessed by a physical examination AND normal ECG AND absence of medical treatment except for the birth control pill). Subject authorizing the treatment of their personal data collected during the study (box checked in the consent form). Subject affiliated to the French social security system.  Exclusion Criteria:  Subject with antecedent of allergies to adhesives or silicone or a skin disease that would preclude the use of an adhesive. Subject with an implantable device such as a pacemaker. Pregnant or lactating women (assessed by a negative ß-HCG test). Subject with a high-altitude stay during the previous 4 weeks (more than 1 week spent over 3,500 meters). Subject with Raynaud's syndrome. Subject in exclusion period (determined by a previous or a current study). Subject under guardianship or trusteeship. Subject under the protection of justice.