The science of
quiet protection
Most wearables are built to count steps. We rebuilt the smart ring from the inside out to do one thing brilliantly: help notice when someone may be in trouble, and get support to them fast.
Developed with input from advisors and experts at the University of Bath, MTIF and Mount Sinai, and from NHS cardiologists, Haelo turns continuous, privacy-first sensing into protection that is always watching out — and never watching you.
The Reengineered Ring
A fitness tracker is built to entertain you with numbers. A protection device has a harder job: it has to be there at 3am, on week-old battery, surviving the shower — and it has to tell a real fall apart from a clap or a hand dropping onto a table.
So we started over. No screen — which removes the single biggest drain on battery and the biggest source of fragility. Medical-grade housing instead of plastic. And three sensors — accelerometer, gyroscope and an optical heart-rate sensor — fused together so the signature of a genuine impact stands out from everyday movement.
Abstract Signals
The most private device is the one that cannot record you. Haelo has no microphone and no camera — at the hardware level, there is nothing to listen or look.
Instead of raw feeds, the ring distils what it senses into abstract signals: compact mathematical patterns that describe a heartbeat or a movement without ever reconstructing your day.
Sense
Motion and vitals are measured continuously, gently, on your finger.
Abstract
Readings become abstract signals on-device — patterns, not pictures of your life.
Protect
Only those signals are used to keep you safe, and they stay yours.
Cloud Intelligence
A number on its own means little. A resting heart rate of 72 is reassuring for one person and an early warning for another. What matters is your normal.
Haelo’s cloud is built to run large AI models continuously — learning each person’s baseline across heart rate, heart-rate variability, temperature, movement and rest, then watching for the meaningful deviations that quietly precede trouble.
Because the work happens in a powerful cloud rather than on a tiny chip, the models can be far richer than anything a wrist or ring could run alone — and they keep getting better without you changing a thing.
How it comes together
Three quiet steps, running every second of every day.
Sense
The ring senses motion and vital signs continuously, turning them into abstract signals on-device.
Understand
Our cloud learns your personal baseline and compares each moment against what is normal for you.
Alert
When something looks genuinely wrong — like a fall or a worrying change — Haelo is built to alert the right people straight away.
Protection, backed by science
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Reserve yoursScientific references
The principles behind Haelo are grounded in published research.
- 1.World Health Organization. Falls (Fact sheet). WHO, 2021.
- 2.Shaffer F, Ginsberg JP. An Overview of Heart Rate Variability Metrics and Norms. Frontiers in Public Health, 2017.
- 3.Allen J. Photoplethysmography and its application in clinical physiological measurement. Physiological Measurement, 2007.
- 4.Li X, Dunn J, Salins D, et al.. Digital Health: Tracking Physiomes and Activity Using Wearable Biosensors Reveals Useful Health-Related Information. PLoS Biology, 2017.
- 5.Mubashir M, Shao L, Seed L. A survey on fall detection: Principles and approaches. Neurocomputing, 2013.
- 6.Sarabia JA, Rol MA, Mendiola P, Madrid JA. Circadian rhythm of wrist temperature in normal-living subjects. Physiology & Behavior, 2008.
- 7.de Zambotti M, Rosas L, Colrain IM, Baker FC. The Sleep of the Ring: Comparison of the ŌURA Sleep Tracker Against Polysomnography. Behavioral Sleep Medicine, 2019.
Haelo is a wellbeing and safety aid, not a medical device, and does not diagnose, treat or prevent any condition. Fall detection cannot identify every fall.
Still curious for more technical specifications?
Go deeper into the engineering — sensor suites, fall-detection algorithms, privacy standards, validation progress and the patents behind Haelo.
Explore our technology and validation