Inclusion Criteria:  21 years or older confirmed diagnosis of moderate-severe COPD or community acquired pneumonia attendance at South Shore Hospital with an exacerbation of COPD / CAP fit for discharge to home  Exclusion Criteria:  suspicion of COVID-19 or confirmed COVID-19 positive life-threatening exacerbation requiring invasive ventilation or prolonged stay in critical care (> 24 hours) unable/unwilling to use Current Health bilateral axillary lymph node dissection persistent atrial fibrillation heavy tattooing on upper arms discharged to skilled nursing facility no access to home or mobile telephone