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Open the app, keep the phone within a metre of the ring and wait 30 seconds. If nothing happens, place the ring in its case for 10 seconds and take it out; this restarts the radio. Sync failures never lose data — the ring stores seven days locally.

Index finger of your non-dominant hand for the cleanest signal. Middle and ring fingers also work. Avoid the little finger and thumb; the sensor may lose skin contact.

Yes. HSRing is rated to 100 m. Rinse in fresh water after salt water or chlorine and dry the inside before charging.

Wear the closest sizer for a full day and night, then choose that size when you order your ring. If the fit is still wrong after delivery, we resize once at no cost within 30 days.

Continuous workout mode and frequent SpO₂ spot checks shorten battery life. Turn off workout auto-detect in Settings → Sensors if you don't use it. A ring that has not been charged for months may need two full cycles to recalibrate.

Within 30 days of delivery, start a return from your order page. We email a prepaid label. Refunds post within five business days of the ring reaching us. Exchanges for size are free once.