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 10)
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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.
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Availability:
Only 10 left in stock, order soon!
Arrives
Thursday, Mar 19
Recently Viewed
Size: 10
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
Wireless Communication Standard: Bluetooth
Battery Cell Composition: Lithium Ion
GPS: No GPS
Shape: Round
Brand: RENPHO
Model Name: R-MZW01
Style: Ring Only
Product Dimensions: 0.78 x 0.78 x 0.12 inches
Item Weight: 1.41 ounces
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:
Thursday, Mar 19
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.
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- 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
Ring size easy to obtain using supplied rings!
Reviewed in the United States on February 2, 2026 by Richard DeMallie Jr
Size: 10
Style: Ring Only
Color: Silver
Thanks to the Google/Fitbit merger, I have been in the market for a new device to track my sleep, steps and other aspects of health as I recover from a chronic illness. Since I don't like wearing wristbands (especially during sleep), I set my sights on a Smart Ring, and the RENPHO Lynx Smart Ring was the 16th I've tried... Sweet 16! After trying multiple generations of Oura, RingConn, Samsung and other "generic" devices, I decided to try one more time. This is when I found RENPHO. I didn't bother with the sizing kit because these rings all follow the same sizing format, and I knew that I could stick with the size 10. Fits perfectly, even when I suffer with swelling, I can just switch to a different hand or a thumb. Even though I do not agree with sleep metrics that claim to detect and differentiate between "Light" or "REM" sleep, there's no getting away from them... They are on every device. What I want is an accurate record of "Awake", "Restless" and "Sleep" time segments from my sleep cycle.(Like I had with Fitbit for 10 years...RIP), but I'm trying to deal with this new metric. RENPHO is the ONLY device that comes close (minus the bogus "Light" sleep) to accurately mapping my sleep cycle. This ring is exactly what I was looking for and I am very happy with the PRO's: *Reasonable price - $170 *No Subscription Fee *Light weight and stylish (I got the silver band) *Easy to setup and it stays connected (unlike some of the others I've tried this year.) *Accuracy with sleep and my few steps... Finally! *HRV, Heart Rate and PulseOx are accurate as well. The only CON (that doesn't affect me) but may be an issue for other users: *Curved profile of the ring makes it slightly thicker than other rings, and might be uncomfortable while handling weights or bars during a gym workout. I would definitely recommend RENPHO and I will update with any changes. **UPDATE** Not sure what happened, but the ring's HRV readings are all over the place and no longer match with my heart rate monitor. The ring would be great for tracking fitness (I'm not there yet), but my focus is wellness during my recovery. I don't think there is a device out there for me.
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Reviewed in the United States on November 9, 2025 by Jaye
Size: 6-13
Style: Ring Sizing Kit
Color: Tar Black
I got this sizing kit because I already own the Renpho Scale and wanted a cheaper ring instead of a Garmin watch. Unfortunately, I ordered the ring from shop and it took 3 weeks to get. I would have had it in a day through Amazon. So: kind of a mistake. Order through Amazon. I do love my ring. If you have the Renpho app already it syncs almost instantly. Battery life is superb: Regular use is 5-7 days, but when you track specific exercise it drops down to 4-5 days. The app shows heart rate, sleep score and 02, fairly accurate, I don't find the stress measurement accurate, but that's not important to me anyway
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Reviewed in the United States on October 25, 2025 by mmatfess
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