Earrings ship within 2–4 business days. Standard delivery is free worldwide and takes 3–7 days; express options are shown at checkout.

Yes, any time before it ships. Reply to your confirmation email or message us from the app and we will swap it.

Open the Nurnex app → Orders, or use the link in your confirmation email.

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.

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.

Not yet. The sensor back needs to seat behind a pierced lobe to keep its optical window in contact.

Up to 8 days depending on usage. Workout heart rate and continuous SpO2 use more power.

Yes. The earring is rated to 100 metres (10 ATM) and is fine in showers, pools, the sea and saunas.

Titanium is tough but not invincible. The plated finishes are ceramic-sealed and resist scratches best; take it off for contact sports.

iOS 16 and later, Android 10 and later. Nurnex works fully on both, including Nurnex Coach.

Yes — CSV export, Apple Health and Health Connect sync, and a full data download from Settings → Privacy.

Never. Health data is never used for advertising or sold, and never used to train models for other people.

No. Nurnex Core covers all daily scores, sleep stages, heart rate, HRV, temperature and cycle tracking. Nurnex+ adds forward-looking insights and the AI coach.

App → Settings → Membership → Cancel. Two taps, no phone call, no retention flow.

Wear it for up to 30 nights. If it's not for you, start a return in the app and we send a prepaid label. Full refund, no questions.

Two years against manufacturing defects, worldwide. Accidental damage and loss are covered by Nurnex Care, available at checkout.