Wellue O2Ring S - Ring pulse oximeter for overnight use

Keep an eye on your oxygen at night

A CPAP treats apnoeas, but it does not measure your oxygen. The O2Ring S fills that gap: a ring worn on your finger while you sleep that records your oxygen saturation and pulse from bedtime to waking. In the morning, your night's curve is waiting on your phone.

Many people on CPAP use it to watch their nights over time and to show the reports to their doctor. Others use it to find out whether it is worth talking to a specialist.

What the S version changes

• A reading recorded every second, where the original O2Ring's reports kept one point every four seconds. A brief desaturation does not slip between two points
• Up to 24 hours of battery, a full night with room to spare, charged over USB-C
• A discreet vibration on your finger if your saturation or pulse goes outside the thresholds you set
• One adjustable size, in soft silicone, with no clip squeezing your fingertip

Which CPAP does it work with