SpO2 Validation Study-Philips Optimus

INCLUSION CRITERIA Participants accepted in this study must meet all the following criteria: * Participant must have the ability to understand and provide written informed consent. * Participant is an adult between 18-50 years of age. * Participant must be willing and able to comply with study procedures and duration. * Participant is a non-smoker or who has not smoked within 2 days prior to the study. EXCLUSION CRITERIA * Participant is considered as being morbidly obese (defined as BMI \>39.5) * Compromised circulation (i.e., Raynaud's Syndrome), injury, open wound, or physical malformation of fingers, toes, hands, ears or forehead/skull or other sensor sites which would limit the ability to test sites needed for the study. Tattoos in the optical path which would limit the ability to test sites needed for the study. (Note: Certain malformations may still allow participants to participate if the condition is noted and would not affect the sites utilized.) * Females who are pregnant * Females who are trying to get pregnant (with confirmation of positive urine pregnancy test unless the participant is known to be not of child-bearing potential) * Participants who have smoked in the last 2 days or participants who have refrained, for at least 48 hours, with COHb levels \>3% as assessed with a Masimo Radical 7 (Rainbow) * Participants with known respiratory conditions such as: (self-reported) * uncontrolled / severe asthma, * flu, * pneumonia / bronchitis, * shortnes…