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bits Ring
Everything we measure, on one finger.
$299
A titanium ring that reads your heart, breathing and temperature all night, then tells you in one number how ready you are for the day.
- Free shipping, dispatched in 2 working days
- 60 days to try it, free returns
- 2-year warranty
- Full app included, no subscription needed
Fits like a ring, works like a lab
Sensors sit flush with the inside of the band, so the reading holds steady when you roll over. Nothing pokes, nothing glows.
A week between charges
Seven days on a charge means you never have to choose between sleep data and a full battery.
Readiness, explained
Every morning the app shows one score and the three numbers behind it, in plain words.
What it measures
8 metrics. Tap one to see how we measure it.
Heart rateHow fast your heart is beating, measured continuously or on demand.
Heart rate variabilityThe small beat-to-beat changes in timing that reflect how rested your nervous system is.
Blood oxygenHow much of your blood's haemoglobin is carrying oxygen.
Sleep stagesHow long you slept and how the night split into light, deep and REM sleep.
Skin temperatureOvernight changes in skin temperature, used to spot illness and cycle phases.
Respiratory rateHow many breaths you take each minute while asleep.
Stress and recoveryA composite score built from heart rate, variability, sleep and sometimes skin conductance.
Cycle trackingPeriod and ovulation predictions improved by overnight temperature and heart rate.
Tech specs
- Battery
- 7 days
- Charging
- Full in 70 minutes
- Water resistance
- 100 m
- Weight
- 3.4 to 4.9 g
- Materials
- Titanium shell, medical-grade epoxy inner surface
- Sizes
- US 6 to 13, free sizing kit
- Sensors
- Green, red and infrared optical sensors
Skin temperature sensor, 0.05 °C resolution
3-axis accelerometer - Connectivity
- Bluetooth LE 5.3. Works with iPhone and Android.
- In the box
- bits Ring
Charging dock
USB-C cable
Sizing kit (sent first)