Inclusion Criteria:  Primary or secondary diagnosis of AECOPD (Acute Exacerbation of Chronic Obstructive Pulmonary Disease) in patients with GOLD 1-4/A-D WHO performance status ≤ 3 Provision of signed and dated informed consent form. Male or female, aged ≥18. Ability and stated willingness to adhere to the study regimen and availability for the duration of the study.  Exclusion Criteria:  3. Inability to provide informed consent including patients still impacted by the use of narcotics as part of emergency care.  4. Intubated patients or patients undergoing a BIPAP/CPAP/NHF treatment and are medically not able to suspend the treatment for the required duration of the visits or expected intolerance of the sensor in their face due to severe respiratory distress.  5. Presence of implanted electronic device intended to regulate cardiac activity (e.g., pacemaker or cardioverter/defibrillator).  6. Pregnancy or lactation. 7. Known allergic reactions to materials used in the components of the SenseGuard™ system, i.e. polyethylene or silicon, or gold, nickel, copper or alloys containing any of the above.  8. Participation in another study that is related to treatment of the respiratory condition.