Finally, no monthly fee
I switched from a smart ring purely because of the subscription. The sleep staging is at least as good, the battery lasts my whole work week and the app doesn't nag me.
Titanium
Graphite
Nurnex Earring
The smart earring that owes you nothing monthly.
4.8 · 2,318 reviews$299or $25/mo · 0% APR
Includes Nurnex Core forever + 3 months of Nurnex+
Today's total$299
No recurring charges. Taxes at checkout.
- Ships in 2–4 business days
- 30-night home trial
- 2-year warranty
- Free worldwide shipping
What's in the box
Everything you need. Nothing to subscribe to.
- Nurnex Earring in your finish — one size
- Magnetic charging dock + USB-C cable
- Care cloth and two spare silicone comfort discs
- Quick-start card — set up in under three minutes
- Nurnex Core membership, included forever
Finishes
Five ways to wear it.
Two 14K gold platings over titanium, and three bare titanium finishes. Same sensors, same battery, same price for Core — forever.
Inside
Six parts. Seven materials. Fifteen millimetres.
Drag to orbit, scroll to zoom, and slide to pull the assembly apart — titanium hook and post, clear resin shell, titanium back cap, battery and logic board, stainless PPG sensor, magnetic charge port.
Tech specs
The numbers, without the asterisks.
Every value on this sheet is measured on production earrings and updated with every hardware revision.
Design
- Materials
- Grade 5 titanium base · 14K gold advanced ceramic plating on Gold and Rose Gold
- Hook drop
- 12 mm(below the piercing)
- Sensor back
- 11 × 9 × 3.2 mm(clear polymer)
- Weight
- 2.1 g(lighter than most studs)
- Fit
- One size · 0.8 mm post · push-on sensor back(standard lobe piercing)
- Water resistance
- 100 m / 10 ATM(swim, shower, sauna)
- Sensor surface
- Optical window on the sensor back, flush against the lobe
Sensing
- Optical
- Multi-path PPG — red, infrared and green LEDs, through the lobe
- Temperature
- 3 × skin temperature sensors, 0.01 °C resolution
- Motion
- 3-axis accelerometer, 3-axis gyroscope
- Blood oxygen
- Nightly SpO2 & breathing regularity
- Sampling
- Continuous, adaptive — up to 50 Hz during workouts
Battery & connectivity
- Battery life
- Up to 8 days
- Charging
- 0 – 100 % in about 60 minutes
- On-device memory
- 7 days of data, syncs when back in range
- Bluetooth
- Bluetooth 5.3 Low Energy
- Airplane mode
- Yes — keeps recording without radio
Compatibility & care
- Phones
- iOS 16 or later · Android 10 or later
- Integrations
- Apple Health, Health Connect, Strava, Google Calendar, CGM partners
- Data ownership
- Export everything, delete everything, any time
- Warranty
- 2 years, worldwide
- Trial
- 30 nights, free returns
Transparent total cost
What it really costs to own.
Most smart wearables are priced like printers: cheap-ish hardware, expensive ink. We think you should see the whole number before you buy.
Over
Nurnex Earring
Core included forever; Nurnex+ optional
$299Oura Ring 4
Membership required after month one
$565Ultrahuman Ring Air
Some PowerPlugs paid
$349Samsung Galaxy Ring
Samsung phone required for full features
$399
Over 3 years, Nurnex Core costs $266 less than the category leader — and you keep every daily score.
Device list price plus any required subscription, at public prices (Sept 2026). Promotions, taxes and optional add-ons excluded. Verify current pricing before purchase.
Reviews
From people who wore it for a month.
4.8
2,318 verified reviews
Readiness actually changed how I train
Three weeks in, the Readiness score predicted a cold two days before I felt it. I backed off, and it never really landed. Worth it for that alone.
Beautiful, light, one small wish
The gold is gorgeous and genuinely feels like jewellery. I wear it on the side I don't sleep on and forget it is there.
Cycle predictions are eerily good
Temperature-based period prediction has been within a day for four cycles. The phase-aware Readiness is the feature I didn't know I needed.
Coach explains instead of lecturing
Asked why my HRV tanked and it pointed to the two late dinners and a red-eye. Clear, specific, done. Then it set up a two-week experiment for me.
Wore it in the pool every day
Swims, showers, sauna. Charged it once a week on the travel case. Zero fuss.
Questions
Visit the help centerBefore you buy.
Do I need a subscription?
No. Nurnex Core is included with every earring, forever, and covers all daily scores, sleep stages, heart rate, HRV, temperature and cycle tracking. Nurnex+ is an optional add-on for advanced, forward-looking insights and the AI coach. You can turn it on or off any time.
Do I wear one or two?
One. The sensor earring reads everything it needs from a single lobe. Wear whatever you like on the other ear.
Does it need sizing?
No. Nurnex is a standard 0.8 mm post with a push-on sensor back — it fits any lobe piercing. There is no sizing kit because there is nothing to size.
Which ear should I wear it on?
Either. Both lobes give the same signal. Most people pick the side they do not sleep on. The hook hangs in front of the lobe; the sensor back sits behind it, where an ordinary earring back would.
Is it comfortable during workouts and sleep?
At 2.1 g it weighs less than most studs. It is rated to 100 m, so it stays on in the pool, shower and sauna. The sensor back is a smooth 3 mm pill, no sharper than a butterfly back, so there is nothing to catch on a pillow or a helmet strap.
What happens if I damage or lose it?
Every earring carries a two-year warranty. Accidental damage and loss are covered by Nurnex Care, which you can add at checkout.
Can I try it and return it?
Yes. Every earring comes with a 30-night home trial. If it is not for you, start a return from the app and we cover the shipping.
Thirty nights to decide. Nothing to cancel later.
Choose your finish · from $299