Mayissi Smart Ring-Sleep-Activity-Stress-SpO2-HR-Tracking-Gesture remote control-Waterproof- No Subscription-15-Days-Battery-Standby-time-iOS & Android-XZR04Black

Product Overview

The black Mayissi ring is the smart ring for men who would rather their tracking did not announce itself. There is no screen and no strap — the band reads as a plain ring at a meeting or across a dinner table, and the sensor array on the inside face holds steady against the skin. Put it on when you get up, swim and train in it, and take it off only when it needs a charge. What it does is the quieter half of health tracking. The companion app sorts all of that into something you can read in a minute over coffee. If you are weighing up a smart ring health tracker, three questions usually decide it: what it costs to keep running, whether you can swim in it, and whether it disappears at two in the morning. Reviews are worth reading for the things a specification list cannot tell you: whether the ring stayed comfortable on the third night, whether the sleep suggestions actually changed a habit, and how the battery held up in a normal week rather than a lab one. Those are the details wearers tend to write about, and they say more about daily life with the ring than any side-by-side comparison on paper. If you like this product once it has been on your hand for a few weeks, say so in a short review — what you track, which finger you settled on, whether the gesture control got used. It helps the next person decide, and it tells us what to improve next.

Comfort, Design & Battery Life

It is the sort of build you forget about by mid-morning — which is exactly what a smart ring health tracker has to do if it is going to stay on overnight. Charging is magnetic. Set the ring on the cable or drop it into the charging case and a full charge takes roughly an hour; there is no port to line up and no flap to lose. The case is the part that matters when you travel, because it tops the ring up between charges and keeps the total running time well beyond the week you would get from a single charge. The two battery figures measure different things. Up to seven days covers typical wear with tracking running; up to fifteen days is how long it holds a charge while sitting idle between trips. Worth knowing before you plan a week away without the case.

Water Resistance & Connectivity

• 5ATM — the rating that lets a smart ring swim — 5ATM corresponds to the static pressure at around 50 m, which covers daily wear, workouts, showers and swimming. It is not built for diving or for a pressure washer. - Made to stay on through a session — the health monitor ring stays on your hand for laps and training rather than coming off at the poolside, and the sealed body means no cap to open or flap to check before you get in. - Bluetooth and GPS support — the ring pairs over Bluetooth and works with the GPS on your phone, so outdoor routes are mapped by the handset while the ring records the effort. - iOS and Android, no adapters — it works with Android 5.1 or above and iOS 8.0 or above, and the app is the same on both.

Daily Tracking & Workout Modes

• Steps, distance and calories, counted on their own — movement is logged from the moment you put the ring on, so a walk to the station and a long day on your feet both reach the app without you starting anything.
• Workout modes for sessions you want kept separate — start a mode before you train and that session is recorded as its own entry, with its own duration and effort, instead of dissolving into the daily totals.
• Heart rate around the clock — continuous optical readings build a daily average and a working range, so a stressful Tuesday looks visibly different from a rest day.
• Exercise history you can compare — every recorded session stays in the app, which makes it easy to see whether the same route is getting easier or the same class is costing you more.
• Nothing on your wrist — there is no screen tapping against a barbell, a keyboard or a saucepan, and nothing glowing under a shirt cuff in a dark room.
• One dashboard for movement and recovery — activity, workouts and overnight data sit in the same view, which is the difference between a health monitor ring you keep checking and a device that ends up in a drawer after a fortnight.

Sleep, Stress & Recovery

The most useful work happens while you are asleep. As a smart ring health tracker it records deep, light and REM sleep across the night and, because it weighs so little, keeps recording across several nights without you noticing it — the app then picks out what tends to interrupt your rest and suggests the bedtime that would suit your pattern most closely. The sleep analysis behind the app was developed with leading universities and hospitals.

It also reads your circadian rhythm and identifies whether you are a morning person or a night owl, then builds schedule suggestions around that instead of a generic eight-hour target. Alongside sleep you get heart rate variability, blood oxygen, body temperature and stress through the day, plus a meditation mode for the moments you want to bring the numbers down deliberately.

Raw figures only help if they turn into something you can act on, so the app rolls them into daily and weekly scores and points out where the pattern shifted — a shorter deep-sleep stretch in a week of late meals, for instance. That translation is what separates a genuinely useful health ring from a stream of numbers you never act on.

Gesture Control & Everyday Extras

• Gesture remote control for photos — prop your phone across the room, step back into the frame and trigger the shutter with a gesture instead of sprinting against the timer. It is a rare extra on a health monitor ring, and it earns its place at group shots and on trips where nobody wants to be the one behind the camera.
• The phone can stay in your pocket — the gesture runs over Bluetooth, so the handset can be propped on a ledge or lying flat on a table while you stay in the shot.
• Ring finder — when it slips off by the sink or into a coat pocket, the finder in the app helps you work out where it went.
• Cycle and physiological reminders — log and receive reminders so the pattern is there to look back on rather than reconstructed from memory.
• Over-the-air updates — features and fixes arrive through the app, so the ring you are wearing in a year is not the one you unboxed.

Cleaning, Storage & Travel

Most of the care is a cloth and a few seconds. Wipe the band and the sensor face with a soft dry cloth once a week, and use a barely damp cloth on the outer shell if it picks up hand cream or sunscreen; keep solvents, alcohol and anything abrasive away from the glossy finish.

After a swim, rinse the ring in fresh water and dry it before it goes back on. Chlorine and salt left sitting on the band and around the sensor window are the usual reason a ring starts to look tired, and a rinse takes seconds.

For storage and travel, the charging case is the safest place — loose in a bag, keys will scratch the gloss. If the ring is going to sit unworn for a while, keep it dry and out of direct sun rather than leaving it on a windowsill.

Specifications

Purchase, Sizing & Packaging

• Sizing comes before anything else — Mayissi rings use their own size scale rather than standard ring sizes, so check the chart against a real measurement of your finger before you order; even a well-made smart ring for men will not stay comfortable in the wrong size. Measure late in the day at room temperature, when fingers are at their largest.
• What arrives in the box — the ring itself, a charging cable or charging case, and a user manual.
• No subscription, one purchase — every feature on the companion app, including continuous tracking and the personalised insights, comes with the ring; there is no monthly fee to access your own data.
• Which finger to measure — a snug fit on the index or middle finger gives the sensors steady skin contact; a ring that spins is loose enough to lose readings overnight.
• Install the app while you wait — the companion app runs on both iOS and Android, so you can set it up and look around before the ring arrives.
• The wider ring family — Mayissi builds several smart ring models with different balances of sleep insight, women's health and sport tracking, so if you want a different finish or a lighter body, look at the rest of the range before you commit.
• Delivery and returns — delivery estimates and the returns window are shown at checkout; check them against your dates before ordering, especially if the ring is a gift.

About Our Company

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.

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