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OURA

Oura Ring 4 - Black - Size 7 - Size Before You Buy

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This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2026

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Availability: Only 3 left in stock, order soon!
Fulfilled by Amazon
Arrives Dec 24 – Jan 9
Order within 9 hours and 15 minutes
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Color: Black


Size: 7


Features

  • SIZE BEFORE YOU BUY - Oura Ring 4 sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit. For additional details, see From the manufacturer section below
  • OURA MEMBERSHIP - First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Or opt for the annual prepaid option for 69.99. Membership is tied to your account via the Oura App, not your physical ring
  • ACCURACY - SMART SENSING - Oura tracks over 50 health metrics, including sleep, activity, stress, heart health, and womens health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you delivering accurate, continuous data, day and night
  • LONG LASTING BATTERY - With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present. From a workout to a night out youre free to forget its on. Until you start getting compliments.
  • HSA/FSA ELIGIBLE - We can accept HSA or FSA funds for the following: Oura Ring, additional chargers, and shipping.
  • DESIGNED FOR 24/7 WEAR - The updated design of the Oura Ring 4 is more comfortable, fits better than ever, and is water resistant. The first all-titanium smart ring combines exceptional durability with a gentle touch, even for sensitive skin.
  • SYNC WITH YOUR FAVORITE APPS - Compatible with iOS and Android Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & more.
  • LOOKING FOR THE BEST HEALTH TRACKER? - Whether youre searching for a sleep ring or fitness ring, Oura Ring 4 is for you this revolutionary smart ring that allows you to discreetly track your sleep, activity, recovery and stress in style.

Description

Introducing Oura Ring 4: the latest evolution of the revolutionary smart ring. Oura Ring 4 brings you closer to what matters most — your health. The updated all-titanium design is powered by Smart Sensing, a new sensing platform that doesn’t just measure your biometrics, it adapts to you, providing insights into over 50 health metrics including sleep, readiness, activity, heart health, stress, metabolic health, and women’s health. Oura Ring quietly and comfortably monitors your health and with 5 to 8 days of battery life — you can forget it’s even on. With multi-ring support, change Oura Ring 4 styles as easily as changing your outfit. If you have two or more Oura Ring 4 styles, you can now switch easily between different finishes in the Oura App. Sleeker, smarter and more accurate than ever, Oura Ring 4 is made for you. Oura Ring is FSA/HSA Eligible — we can accept FSA or HSA funds for the following: Oura Ring, additional chargers, and shipping. IMPORTANT: Size yourself with the Oura Ring Sizing Kit before you buy — Oura Rings are not US standard sizing, and finding the right size will result in the best experience possible. With a sizing kit purchase, a credit will automatically be applied to your Oura Ring at checkout.

Special Feature: Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight


Battery Capacity: 80


Connectivity Technology: Bluetooth


Wireless Communication Standard: Bluetooth


Battery Cell Composition: Lithium Polymer


GPS: GPS Via Smartphone


Shape: Round


Brand: OURA


Model Name: JZ90-54144-07


Style: Minimalist


Product Dimensions: 0.94 x 0.94 x 0.28 inches


Item Weight: 6.4 ounces


Item model number: JZ90-54144-07


Batteries: 1 Lithium Polymer batteries required. (included)


Connectivity technologies: Bluetooth


GPS: GPS Via Smartphone


Special features: Activity Tracker, Cycle Tracking, Daily Workout Memory, Lightweight


Other display features: Wireless


Human Interface Input: Unknown


Color: Black


Battery Power Rating: 8E+1 Milliamp Hours


Whats in the box: Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide


Manufacturer: Oura


Date First Available: October 3, 2024


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Dec 24 – Jan 9

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.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • The Oura ring is the BEST!!
Color: Silver Size: 9
Review Image by Lauren Lauren
Review Image by Lauren Lauren
I absolutely LOVE my Oura ring. It has exceeded all of my expectations. As someone who previously wore a fitness watch, I say that the ring is much more comfortable, cute, and convenient. I wear it 24/7, including overnight for sleep tracking and rarely notice it there. This is coming from someone who used to take off all my jewelry before going to bed. The only time I take it off is when I am showering and that is when I charge it! The ring is able to go in water though which makes it super convenient for swimming and life with kids.The battery life is phenomenal, meaning I don’t have to constantly worry about charging it. It’s been very accurate for monitoring my cycle as well. You can double it with natural cycles as a very accurate form of natural birth control/cycle monitoring. It’s also surprisingly stylish and sleek. If you want an overall fitness/health tracker, this is the one for you! ... show more
Reviewed in the United States on December 2, 2025 by Lauren Lauren
    • Tracks everything and is so easy to use
Color: Gold Size: 9
I finally got my hands on one of these bad boys! I took advantage of the Black Friday 30% off deal since these never go on sale! I’ve been eyeing them for over a year and wanted to pull the trigger! I’m honestly so glad i decided to get one! I love that it tracks my sleep, ovulation, stress, day to day readiness, steps, activity, etc. It’s everything I used to use other apps/watches/trackers for but in an easy, accessible, SMALL gadget. I love that it’s waterproof and I can wear it in the shower, love that i was able to get a gold ring to match my wedding ring and other jewelry i wear as well. You will have to BUY and app to get all the insights the ring has to offer, so keep that in mind. It is an annual or monthly cost of around $65 i believe. In my opinion, it’s worth it. I paid the one time annual fee to get it over with and now i don’t have to think about it. Everything is extremely easy to set up on the app, charge the ring, and set it up. I’ve had the ring a little over a week and the sleep data is my favorite right now. As a mom with a 6 mo and 22 mo, my sleep is LACKING but this helps me make sure i stay on track of it to the best of my ability right now! It lets me know how many hours i slept, my resting/sleeping heart rate, my REM, deep, and light sleep; and how long I was in each stage, tells me my readiness for the next day, etc. The ring does run larger than your normal size. I got a 9 and wear it on my middle finger which would normally be an 8. Keep that in mind. There are kits to try your size prior to buying, an a lot of stores have the try on kits to make sure you order the right size too! All in all, the ring is worth the price in my opinion and I wish i would have gotten it sooner because i love it so much! ... show more
Reviewed in the United States on December 3, 2025 by TheMidsizeMoore
    • super worth it purchase for cycle tracking
Color: Silver Size: 7
amazing for tracking your cycle with natural cycles without having to check your basal body temp with a thermometer !! it literally checks your temp all night ! it was super easy to set up, but it does get scratched easily so i wiuld not say that it is super durable. i personally dont think the scratches are that noticible but they are deffinitly are there ! it is really comfortable and you stop even noticing it is there. it looks much better than a smart watch but it is obviously not like a beautiful ring or something ya know its a plain silver looking thick band. ... show more
Reviewed in the United States on November 9, 2025 by Alex
    • Amazing data collection… but a very steep price and short life.
Color: Silver Size: 12
Review Image by Josh A. Josh A.
Review Image by Josh A. Josh A.
Review Image by Josh A. Josh A.
Review Image by Josh A. Josh A.
Review Image by Josh A. Josh A.
Review Image by Josh A. Josh A.
Review Image by Josh A. Josh A.
Note: This is a long term review, after owning the ring for 10 months. It disappoints me to have to give this a 1 star review, because when the ring works, it works. It’s very convenient, accurate, un-intrusive to wear, and gives you a ton of valuable data, especially related to your cardiovascular system. But, out of the blue about 10 months into my ownership, battery life has cratered, and even when it doesn’t run fully discharged, it has randomly started disconnecting, meaning it’s not harvesting the data that I expect and want it to, and even worse, without full days of data, it won’t build any trends, meaning the limited data it does collect is useless. Reading online it seems I am not the only person experiencing this disappointment. Oura’s customer service is non existent. I have yet to figure out how to get in contact with a human there. All their customer service is routed through “Finn” their AI assistant. After trying everything that “Finn” has recommended numerous times, and getting nowhere, it would be an understatement to say I am frustrated. One of “Finn’s” suggestions is to fully wipe the ring and app from your phone and reinstall it, and if that doesn’t work, the implication from the system is that it will then elevate it to a customer service rep. The issue with that is when you do that, a hard reset and reinstall, the record with “Finn” also seems to go with it, so the system will never engage a human, it comes across almost like it’s intentional firewall in their service. I am coming up on my 1 year membership renewal. I am at the point where I need to decide if I need to make the $72 annual investment again. I would gladly spend that again, but I’m not really looking at a $72 investment. Given my current ring performance, this means buying another ring. Between the membership and a new ring, with taxes, shipping, etc, etc, etc that’s a near $500 investment; and since it only made it 10 months, that really means it’s effectively closer to $600 a year. Battery powered wearables have a limited life; I went into this understanding that, but, I don’t think that after less than a year of usage, going from ~5 days of battery life and collecting non-stop data to less than 24 hours of life with random crashes is in any way acceptable. Apple or Garmin or Google would have mass recalls or replacements on their hands if their wearables behaved like this. Good health is priceless. The ring helped me tremendously in my fitness journey. I have lost over 65 lbs with its help. At this point, however, given I have hit and am maintaining my weight goal, and from my current experience as well as based on what I read from others online, I refuse to spend any more money with Oura, simply because of their poor customer service and poor product life. My final thoughts: the ring makes your fitness journey significantly easier. Data is king when you’re committed to self improvement. For that, I give it 5 stars; but if you buy one, understand that it most likely will not make it to a year without some sort of collection or battery issue. You have to decide for yourself if $500 for 10-ish months of data is a fair price to pay. ... show more
Reviewed in the United States on September 13, 2025 by Josh A. Josh A.
    • Great device, meh quality finish
Color: Stealth Size: 11
Review Image by Roger Roger
Its a really impressive little device. I was sold when my uncle told me his predicted him getting sick accurately a few times, and I personally wanted to observe my sleep patterns more closely. It works amazingly to deliver you real metrics for how much time you spend getting quality rest based on your body's biometrics. I just wish it was more durable. I work a desk job, this was delivered to me the on 11/26 and this is being written on 12/1. Stealth finish. You can wear it in the shower or doing anything else though. Use common sense like taking it off for a workout. ... show more
Reviewed in the United States on December 1, 2025 by Roger Roger

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