RENPHO Lynx Smart Ring R-MZW01, Silver, Size 10

Silver: The RENPHO Lynx smart ring (R-MZW01) is a size 10 wearable that tracks sleep, activity, heart rate and other listed health metrics through the RENPHO Health app. Its no-subscription claim and compact ring format may suit buyers who want app-based tracking without a wrist-worn device, though correct sizing is particularly important.

At a glance

Tracks sleep, heart rate, blood oxygen, stress, steps, distance and calories according to the listing.
The RENPHO Health app is listed as compatible with iOS and Android, with no subscription fees required.
The listing claims a 7-day battery life and says a charging case is included.
Sizing is unique to RENPHO Lynx. The listing recommends using the official RENPHO sizing kit before purchase.

Price

$154.99Save 22%

Reference price: ~~$199.00~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

No subscription fees are required for the RENPHO Health app, according to the listing.
A broad set of sleep and activity measurements is listed, including heart rate, blood oxygen and stress.
The compact ring form weighs 4.81 g according to the listing.

Cons

No GPS is listed, so the ring is not presented as a standalone GPS tracker.

Technical specifications

19 specifications

Identity
Brand	RENPHO
Model	R-MZW01

Display and video
Screen technology listed	LED

Connectivity and controls
Wireless connection listed	Bluetooth
App / operating system listed	RENPHO Health
Phone compatibility	Compatible with iOS and Android devices

Power and battery
Battery type	Lithium Ion

Dimensions and installation
Form factor	Round
Dimensions listed	0.78 x 0.78 x 0.12 inches
Weight listed	4.81 g
Size	Size 10

Materials and protection
Water resistance listed	Waterproof
Water resistance depth	50 meters
Material listed	Titanium Alloy PC Resin

Tracking and features
Listed features	Sleep Monitor, Activity Tracker, Heart Rate Monitor
Metrics listed	Sleep Duration, Heart Rate, Blood Oxygen, Stress, Distance, Step Count, Calories Burned
GPS	No GPS
App subscription	No subscription fees required
Battery life claim	7-day battery life

What to know before buying

Listing details to confirm

The listing recommends measuring with the official RENPHO sizing kit because Lynx sizing differs from standard jewelry rings and other brands. It also says to wear the orientation marker toward the palm and recommends the index finger of the nondominant hand for sensing accuracy. The title and product details identify a ring-only style, while a feature claim says a charging case is included. Confirm whether a charging case is part of the selected listing before buying. The listing also labels the display technology as LED despite describing a ring, and its dimensions differ between 0.78 x 0.78 x 0.12 inches and 0.12"D x 0.12"W x 0.12"H. These details are inconsistent or unconfirmed, not established product defects.

What’s in the box

Smart ringIncluded
Charging caseCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

Buyers seeking app-based sleep, heart-rate and activity tracking in a ring rather than a wrist wearable.
People who want the listed iOS and Android compatibility and no app subscription fees.

Less suited to

Buyers who need GPS tracking from the wearable itself.
Anyone unwilling to check ring sizing with the brand-specific sizing kit before ordering.

RENPHO Lynx Smart Ring R-MZW01, Silver, Size 10 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4 / 5 · 749 ratings

5 stars62%62%
4 stars12%12%
3 stars7%7%
2 stars5%5%
1 star14%14%

Aggregate customer ratings are mixed overall: most fall in the five-star category, but a notable share are one-star ratings. The rating distribution does not explain the reasons behind individual scores, so it cannot establish particular strengths or defects. Consider whether the listed sleep and activity tracking, app compatibility and brand-specific sizing suit your needs.