There is no screen, no strap and nothing to tap, so nothing interrupts a meeting or a night's sleep. It collects heart rate, blood oxygen, sleep and daily movement quietly, and the companion app turns those readings into something you can read over coffee the next morning. It is a health tracking ring for people who want a few clear numbers rather than another device competing for attention. Most people arrive here from one of two places. Some are replacing a fitness band that ended up in a drawer; others are tired of taking a smartwatch off every night because it was too bulky to sleep in. A good sleep tracker ring solves both: it sits flat under a shirt cuff, does not catch on bedding, and still looks like a ring rather than a gadget. - Desk days and deadline weeks. During the working day the ring reads heart rate and stress without a screen lighting up in a meeting. Over a month it shows whether a heavy week is actually landing on your body or whether you have simply been busy. - Overnight, every night. Nothing to take off, nothing to charge at 11 p.m. As a smart ring sleep tracker it works because the ring stays put while you sleep, which is exactly where a watch falls short. - Training blocks. A hard stretch of sessions shows up in heart rate and recovery before it shows up in how you feel, which is the point of wearing the ring to the gym as well as to bed. - Weekend swims. Laps land in the same app as everything else, so a session does not vanish just because you got wet. - Business travel and formal days. The black finish reads as a plain band with a suit, and there is no second device to pack or charge — the kind of detail that decides whether a wearable smart ring gets worn or left in a washbag. - A first wearable for someone who dislikes gadgets. No screen and no menus on the device itself; everything happens in the app. That makes this a smart health ring that suits people who never got on with a smartwatch.
| Daily activity | Steps, distance, calorie counts and exercise records |
| Heart metrics | Heart rate, blood oxygen saturation (SpO2) and heart rate variability |
| Sleep | Night-by-night tracking of deep, light and REM stages |
| Stress and recovery | Stress monitoring plus guided meditation sessions |
| Sports | Multiple sport modes for training sessions and outdoor days |
| Gesture control | Music play or pause, short-video switching, e-book page turns |
| Everyday extras | Ring finder, remote camera shutter and in-app games |
Sleep is where this ring spends most of its energy. Every night it separates deep, light and REM sleep, logs the minutes you spent awake, and gives the night a sleep-efficiency score so two weeks can be compared instead of guessed at. The app also supports the stretches where sleep broke and sets them against the rest of the night, which is more useful than a single figure in the morning — a 3 a.m. wake-up after a late meal looks very different from one after a stressful day.
The same sensors watch the daytime side: heart rate through the day, blood oxygen saturation, and heart rate variability, the recovery signal most people never see on a watch. That combination is what turns a sleep tracker ring into something closer to a picture of your week — a heavy training block or a run of late nights shows up in the numbers before it shows up in how you feel.
Underneath, the sleep analysis is built on algorithms developed with leading universities and hospitals, and the ring receives over-the-air updates, so the analysis improves after you buy rather than staying frozen at the version that shipped. For a smart ring health tracker, that matters: the value is in the trend across months, not one good night.
The ring carries a 5ATM water-resistance rating, the level that covers daily wear, workouts and swimming. In practice you can leave it on for the pool, the shower and a rainy commute, and take it off only for diving or anything involving high-pressure jets. Rinse and dry it after a pool session and the finish stays happy.
The black finish is the other half of durability. It is tarnish-resistant, so the surface is meant to hold its colour instead of developing the dull bloom that plated jewellery picks up — which is why this version works as an everyday smart health ring rather than a dress ring you take off before chores.
Connectivity is deliberately ordinary: Bluetooth pairing with both iOS and Android, and an operating temperature range of 0 °C to 50 °C. That covers a cold morning run and a warm car; a freezer or a dashboard in direct summer sun does not.
Once paired, a ring to track health should disappear into the background. It syncs with the app whenever the phone is nearby, so there is no session to start before bed and no button to press after a workout.
| Model | Finish | Standout features | Ideal for |
|---|---|---|---|
| Tarnish Black (this ring) | Tarnish-resistant black | Tarnish-resistant finish, ring finder, in-app games, gesture control, waterproof body | Buyers who want a low-maintenance black ring with everyday phone controls and a discreet look |
| AI Insights (Silver, Gold, Black) | Silver, gold or black | AI-assisted sleep analysis developed with universities and hospitals, women's health tracking, 5ATM water resistance, about 2.5 g, up to 7 days of active use with 15-day standby | Sleep-focused buyers who want a sleep tracker ring with deeper nightly analysis and a lighter ring |
| Health Management (Silver, Gold, Black) | Silver, gold or black | Skin temperature, heart rate, SpO2, sleep, stress, HRV and women's health with cycle reminders, 5ATM water resistance, 5–7 days of active use with 15-day standby | Buyers who want cycle awareness and skin-temperature context alongside sleep and stress |
| XZR04 Black | Black | Gesture remote control, sleep, activity, stress, SpO2 and heart-rate tracking, 5ATM water resistance | Men or gesture-control fans who want a swim-ready black ring |
| XZR06 Silver | Silver | IP68 water resistance, activity, sleep, heart rate and SpO2 tracking, remote photo control, 15-day standby | Simple all-day tracking with IP68-rated water resistance |
| R02 Sports (Rose Gold) | Rose gold | Multiple sports modes, time, steps, calories, heart rate, blood oxygen and sleep, plus a charging compartment | Fitness users who want workout modes and a charging backup in the box |
This health tracking ring is a wellness tool, not a medical device. It does not diagnose, treat or rule out any condition, and it is not a substitute for an ECG, a blood-pressure cuff or a sleep study. Its readings are designed to show everyday patterns — how your heart rate moves, how your nights compare, how stress accumulates — rather than to produce a clinical result. Blood oxygen and heart-rate figures are for general awareness, not for confirming or excluding illness. Sleep stages and scores are pattern guides, not a lab-based diagnosis. If you have a diagnosed heart or sleep condition, use an implanted device, or take medication that affects your heart rate, speak with your clinician before relying on the ring. Do not change medication or treatment based on what the app shows. If a reading looks unusual and stays unusual, treat it as a prompt to seek medical advice, not as an answer. Within the Mayissi range, none of the rings is a diagnostic instrument; choose the model whose everyday features fit your habits, and use the trends as context you can share with a professional.
Mayissi is the smart-ring brand of Tide Forge Tech, a health-monitoring technology company based in Shenzhen High-Tech Park (Nanshan), China, established in 2026. Our team of ten designs, develops and builds wearable health-tracking devices that are sold to customers worldwide. Because research, design and production sit under one roof, we can watch quality at every stage, from sensor performance to the finish you wear. Every customer receives clear setup guidance and responsive after-sales support, with our team reachable around the clock.
