Covid: How a £20 gadget could save lives - BBC News
Doctors Warn FDA of Risks Posed by Flawed Oxygen Devices - The New York Times
Amazon.com: Wellue Wearable Pulse Oximeter - Rechargeable O2ring Bluetooth Oxygen Saturation Monitor with Reminder, Continuous Tracking of Oxygen Level and Pulse Rate with Free APP & PC Software : Health & Household
Blood oxygen monitors face scrutiny from FDA panel - The Verge