RENPHO Lynx Smart Ring R-MZW01: features, sizing and specs

The RENPHO Lynx Smart Ring (model R-MZW01) is a wearable that fits on a finger instead of the wrist. It is designed for all-day tracking of sleep and activity, and it comes with a charging case. This listing is the silver version in size 11. Here is what it offers and what to know about sizing.

What it tracks

RENPHO says the ring can monitor sleep, blood oxygen levels, stress, heart rate, steps, distance and calories burned. It can also track activities such as walking and running. The brand presents this as a way to see trends and support fitness goals. Wearable readings are general wellness information and are not a substitute for medical advice or devices.

Sizing comes first

RENPHO stresses that the Lynx uses its own sizing, different from standard jewellery rings and other smart ring brands. To get an accurate fit, the brand says to buy and use the official RENPHO Sizing Kit before choosing the ring. A smart ring needs good contact with the finger to read well, so fit matters more than with a normal ring. Fingers also change size slightly with temperature and the time of day.

Battery and charging case

The ring is rated for 7 days of battery life. The charging case adds an extra charge and gives safe storage when you are out, which also reduces the risk of losing a small ring. RENPHO suggests this suits travel and business trips. Battery life typically varies with how many features are used.

Materials and water resistance

The exterior is titanium, designed for 24/7 wear, and the ring is rated 5ATM waterproof. A 5ATM level generally covers pressure equal to about 50 metres of depth in testing, which means it is designed to cope with swimming and washing hands. RENPHO says it can endure activities like swimming and hiking.

App and compatibility

The ring pairs with the Renpho Health App on iOS and Android. RENPHO says no subscription is required, and the app syncs with Apple Health and Google Health Connect, so data can be shared with those platforms.

Who it suits

It suits people who prefer not to wear a watch, who want sleep and activity trends from a discreet device, and who like the idea of using an app without a subscription.

What to check before you buy

• Ring size: use the official RENPHO Sizing Kit first; this listing is size 11.
• Colour and finish: this listing is the silver version.
• Phone compatibility: check your phone works with the Renpho Health App, and with Apple Health or Google Health Connect if you want to sync.
• Comfort: think about whether you are happy wearing a ring all day and during sleep.
• Charging: the case needs its own charging, so check the cable and power source you will use.
• Expectations: treat the readings as general wellness information.

The short version

• A titanium smart ring with 5ATM water resistance, model R-MZW01.
• Tracks sleep, heart rate, steps, distance, calories, stress and blood oxygen, according to RENPHO.
• 7-day battery life, with a charging case included.
• Works with the Renpho Health App on iOS and Android; no subscription required.
• Uses its own sizing, so get the official sizing kit first.

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