Looking for a blood oxygen smartwatch for women that actually tracks SpO2 alongside the rest of your health data, instead of just showing a heart rate number? The REXQU AuraSense builds blood oxygen monitoring directly into its all-day tracking, right next to heart rate, blood pressure, and cycle tracking.
Blood Oxygen Smartwatch for Women: How AuraSense Does It
The REXQU AuraSense uses an optical sensor on the back of the case to estimate blood oxygen saturation (SpO2) by shining light through the skin and measuring how much of it is absorbed by oxygenated versus deoxygenated blood. It runs this alongside continuous heart rate tracking with warning alerts, blood pressure readings, sleep quality scoring, and menstrual cycle reminders — all on a 1.32″ AMOLED display (466×466) with a crystal-set bezel.
What a Blood Oxygen Reading Actually Tells You
SpO2 readings on a wrist-worn device like this are a wellness metric, not a diagnostic one — useful for noticing patterns over time (like consistently lower readings at altitude, during a cold, or after a hard workout) rather than for catching a medical condition. The AuraSense takes spot checks on demand and in the background during sleep, which is when oxygen saturation tends to dip naturally and is worth watching if you’re curious about your sleep quality.
If you want to understand the sensor technology itself, Wikipedia’s overview of pulse oximetry explains how optical SpO2 sensing works in both clinical devices and consumer wearables.
What Else Comes With the AuraSense’s Blood Oxygen Tracking
| Feature | REXQU AuraSense |
|---|---|
| Blood oxygen (SpO2) | Included, on-demand + background during sleep |
| Heart rate | All-day tracking with warning alerts |
| Blood pressure | Included as a wellness reading |
| Cycle tracking | Menstrual cycle reminders |
| Display | 1.32″ AMOLED, 466×466, crystal-set bezel |
| Extras | AI voice assistant (GPT), Bluetooth calling, 107 sport modes |
| Battery | Up to 5 days use / 30 days standby |
| Water resistance | IP68 |
| Price | $139.97 |
Who Should Care About This Feature
If you travel to higher elevations, do endurance training, or just like having a fuller picture of your overnight recovery, a blood oxygen smartwatch for women like the AuraSense gives you that data without needing a separate pulse oximeter clipped to your finger. It’s most useful as a trend-tracking tool — checking whether this week’s readings look like last week’s — rather than a one-time number to obsess over.
This feature is a wellness tool, not a medical device. If you have ongoing concerns about your oxygen levels, heart rate, or blood pressure, talk to a doctor rather than relying on a wrist sensor for diagnosis.
Getting a Reliable Reading
Like any optical SpO2 sensor, a blood oxygen smartwatch for women reads more accurately when the case sits flush against your skin, your arm is still, and the band isn’t too loose. Wearing it slightly higher on the wrist (above the wrist bone) for a spot check, rather than relying on a loose everyday fit, tends to give a steadier number if a reading looks off.
Does it need a subscription? No — blood oxygen, heart rate, blood pressure, and cycle tracking are all built into the AuraSense app at no extra cost, with no recurring fee to see your history.
How often does it check automatically? The AuraSense takes background SpO2 readings periodically throughout the day and specifically during sleep tracking, in addition to any on-demand check you run yourself.
Is This the Right Blood Oxygen Smartwatch for You?
The AuraSense bundles SpO2 tracking with blood pressure, cycle tracking, and an AI voice assistant into one $139.97 watch, which makes sense if you want one device handling most of your daily health picture rather than several single-purpose gadgets. Compare it against the rest of REXQU’s lineup on the women’s smartwatches category page, or see the full spec breakdown on the best smartwatch for women comparison guide.