RENPHO Lynx Smart Ring-All Day Sleep & Activity Tracking, Includes Charging Case, Gifts for Men, 7-Day Battery Life, Subscription-Free App for iOS & Android, Size Before You Buy (Black, Size 12)
Condition: New
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Learn more about financing & leasing here.
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30-day returns
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30-day refund / replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Only 4 left in stock, order soon!
Arrives
Friday, Mar 27
Recently Viewed
Size: 12
Style: Ring Only
Color: Black
Features
- Comprehensive Insights: Monitor your sleep, blood oxygen levels, stress, heart rate, steps, distance, and calories burned. The RENPHO LYNX Smart Ring can also track fitness activities such as walking and running, gaining detailed insights to support your fitness goals.
- No Subscription Fees: Seamlessly connect the RENPHO LYNX Smart Ring with the Renpho Health Appno subscription fees required. Compatible with both iOS and Android, the App syncs with Apple Health and Google Health Connect.
- Convenient Charging: The RENPHO LYNX Smart Ring boasts a 7-day battery life and includes a charging case for an extra charge and safe storage while out, eliminating the risk of loss. Ideal for long-term travel or business trips, ensuring your ring is always powered and ready for your adventures.
- All-Day Wear: 5ATM Waterproof and designed with titanium exterior for 24/7 wear, the RENPHO LYNX Smart Ring endures activities like swimming and hiking, making it a reliable companion for tracking your health and fitness data come rain or shine.
- Precision Tracking at Your Fingertip: Empowered by a sophisticated chip and sensor, the RENPHO LYNX Smart Ring is meticulously designed to offer precision and reliability in data tracking and serves as your personal health consultant anytime, anywhere.
- HSA/FSA Eligible: The RENPHO LYNX Smart Ring is eligible for purchase with most Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA).
- Wearing Guide: To ensure the most accurate measurements, please make sure the orientation indicator is facing towards your palm. In addition, please remove the RENPHO LYNX Smart Ring before applying slippery substances to your hands to prevent it from falling off.
Operating System: RENPHO Health
Special Feature: Sleep Monitor, Activity Tracker, Heart Rate Monitor
Connectivity Technology: Bluetooth
Battery Cell Composition: Lithium Ion
GPS: No GPS
Shape: Round
Brand: RENPHO
Model Name: R-MZW01
Style: Ring Only
Color: Black
Product Dimensions: 0.85 x 0.85 x 0.12 inches
Item Weight: 1.41 ounces
Item model number: R-MZW01
Batteries: 1 Lithium Ion batteries required. (included)
Date First Available: August 31, 2025
Manufacturer: RENPHO
Item Weight: 0.04 Kilograms
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Mar 27
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Size: 6-13
Style: Ring Sizing Kit
Color: Tar Black
The sizing kit worked great! I wanted to replace a much cheaper fitness ring and figured the sizing would probably be the same (size 10). I figured it was worth the kit price to double check - and it was delivered quickly. It DID fit slightly tighter than my old ring so I wore the sizer for a couple of days. By the time I ordered the ring, I was reassured that it would fit comfortably and could be easily removed for charging even if my fingers were slightly swollen. My new ring fits perfectly and is MUCH more accurate. The app is definitely superior and much easier to use. Buy it!! :)
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Reviewed in the United States on August 22, 2025 by Teri
Size: 8
Style: Ring Only
Color: Silver
There are several rings on the market that monitor your health and I have tried several (except Oura - I refuse to pay a subscription after forking over hundreds of $$). I have paid between $45 - $299 and all of them run out of juice after about 3-4 days. But this one from Renpho is the BEST!! I paid about $187, there is no monthly subscription fee, it is very accurate and connects to the app in my phone with NO ISSUES. I didn't order the ring sizer. I just ordered the same size as all of the other rings I previous purchased and it was a perfect fit. The most absolutely best thing about it is that the battery life lasts 9 - 10 days between recharging. Now I will say that the life span depends on how many times you connect to the app to check on things but I could check it every night and morning and at lease a couple of times per day and that was still the amount of life I consistently got from it between recharge times. It can track just about everything the apple watch will except the new apple watches will detect sleep apnea where Renpho does not. Also this ring is eligible for FSA purchases. It is a little bit thicker than the others but is not impeding and it isn't weighty. I don't even notice I am wearing it. Again, if you are shopping for a health ring and just don't know which one to choose, this one is the ONE!
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Reviewed in the United States on October 16, 2025 by Marijean L Higgins
Size: 6-13
Style: Ring Sizing Kit
Color: Tar Black
A must before ordering a chunky smart ring. Not only do you get the size right, you get to feel a ring on a finger you may not already have a ring on. And you may discover that's not the best finger for another ring. Just saying.
Reviewed in the United States on January 6, 2026 by J Luyties
Size: 7
Style: Ring Only
Color: Black
Bought this for my hubby and I, trying to help track sleep and sleep disturbances for things like sleep apnea. This is NOT the product for that! It does track your sleep and many other things, but unlike something like an Apple Watch, does not identify disturbances of that nature. Outside of that, it's a great tool to track your health if you don't like using a watch.
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Reviewed in the United States on January 16, 2026 by Courtnie
Size: 12
Style: Ring Only
Color: Silver
Works like a champ. Great fit. Good battery life.
Reviewed in the United States on December 15, 2025 by Thomas McBrearty
Size: 9
Style: Ring Only
Color: Silver
I recently purchased this ring and can confirm it is of excellent quality. The app is super easy to navigate, you can sync it with Fitbit and other health related apps. It monitors your sleep, heart rate, blood pressure, blood oxygen levels, steps, calories burned, exercise and you can even input aspects of your diet. I haven’t tested it yet but I believe you can also pair it with a smart scale. It is a little on the large side so it definitely seems more oriented towards men but from one customer to another I say this is a good purchase.
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Reviewed in the United States on June 17, 2025 by Christopher Armstrong Christopher Armstrong
Size: 6-13
Style: Ring Sizing Kit
Color: Tar Black
As long as you know these are for small to not large sized fingers. 13 is the biggest and I almost needed one larger but I do not have large fingers. The box was nice but this is a weird item as you need it only to figure out your size before ordering your smart ring. They almost should have a forced return policy to reduce waste. Sleep with it on to so how it goes over night. But hard to go wrong with such a simple product
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Reviewed in the United States on November 21, 2025 by Tryin
The media could not be loaded. I paid for a new device, but suspect I might have been given a "refurbished" or defective unit. Instructions say it required a 1.5 hour charge before set up, but both the ring and case were fully charged 100% out of the box. Anyway, the device constantly disconnects and at least once per 24 hours I have to put the ring in the case just to get it to sync/update stats. So basically when this happens, I can't take active readings or see recent stats if I don't have the case readily available. The ring looks great and is comfortable. The step-counting feature is wildlyinaccurate. Every morning I wake up with 200-400 steps taken while sleeping. I sat on the couch for 2 hrs yesterday, completely motionless, and somehow logged almost 3,000 steps in that time. I mostly got this to check my heart rate through the day and track my sleep. Both features work well as long as the device decides to connect. Im on day 5 of wearing my ring and it did not track my sleep at all last night even though i never took the ring off. I like this ring but I think I'll be asking for a replacement, so i can give the product a second chance.
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Reviewed in the United States on July 31, 2025 by Foster