TIMCIs: A Hybrid Type 2 Study of Next-generation Pulse Oximeters

Inclusion Criteria: * Children 0 - 59 months for whom caregivers provide consent to participate in the research study, following completion of clinical consultation * Consulting for a respiratory illness, or reported to have a respiratory illness when attending for a routine visit as an outpatient (e.g., vaccination, growth, or chronic disease monitoring) Exclusion Criteria: * Children in the immediate post-natal period or first day of life * Attending for a consultation related to trauma only (including new and follow-up presentations for burns, injuries, wounds) * Admitted within an inpatient part of the facility (including neonates delivered at the facility admitted with their mother) * Children who are critically ill, requiring emergency treatment, or received a recommendation of immediate referral during clinical consultation