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OURA

Oura Ring 4 - Black - Size 10 - Smart Ring - Size First with Oura Ring 4 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life

  • Based on 3,644 reviews
Condition: New
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$349.00 Why this price?

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Availability: Only 2 left in stock, order soon!
Fulfilled by Amazon
Arrives Tuesday, Jun 24
Order within 2 hours and 29 minutes
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Color: Black


Size: 10


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 brand 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 30 biometrics, 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
  • 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
  • HSA/FSA ELIGIBLE - We can accept HSA or FSA funds for the following: Oura Ring, Oura Ring Chargers
  • 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 30 biometrics including sleep, readiness, activity, heart health, stress, metabolic health and women’s health. Oura Ring 4 quietly and comfortably monitors your health and with up to 8 days of battery life — you can forget it’s even on. Sleeker, smarter and more accurate than ever, Oura Ring 4 is made for you. Oura Ring 4 is FSA/HSA Eligible — we can accept FSA or HSA funds for the following: Oura Ring 4, additional chargers, and shipping. IMPORTANT: Size yourself with the Oura Ring 4 Sizing Kit before you buy — Oura Ring 4 is not US standard sizing, and finding the right size will result in the best experience possible. With an Oura Ring 4 Sizing Kit purchase, a credit will automatically be applied to your Oura Ring 4 at checkout.

Wireless Communication Standard: Bluetooth


Battery Cell Composition: Lithium Polymer


Brand: OURA


Color: Black


Included Components: Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide


Item dimensions L x W x H: 1.06 x 1.06 x 0.28 inches


Human Interface Input: Buttons


Wireless Carrier: Unlocked


Manufacturer: Oura


Product Dimensions: 1.06 x 1.06 x 0.28 inches


Item Weight: 6.7 ounces


Item model number: JZ90-54144-10


Batteries: 1 Lithium Polymer batteries required. (included)


Other display features: Wireless


Human Interface Input: Buttons


Color: Black


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


Manufacturer: Oura


Country of Origin: Estonia


Date First Available: October 3, 2024


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Jun 24

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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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • I love it!
Color: Silver Size: 8
I don't like wearing wrist watches, so having a smart ring is PERFECT for me! I love how durable it is, it's easy to clean, and the app that comes with it is GREAT! The tracking on this thing is flawless and it uses light sensors to track my vitals, so it doesn't even feel like a smart device, just a regular ring! It also charges very quickly, so if I'm using the bathroom or taking a shower at home, I just pop it on the charger for 10-15 minutes and it's good for a few days! I only do it daily just to establish a good routine, and I have forgotten before and let the battery get low, but still haven't had the power die on me yet! I can see it being an issue for lifting weights since it's coated in stainless still and a little bulky, but otherwise very comfortable for other forms of exercise! I can also see it being a problem because of the red and green light sensors at night, it might be disruptive to light sleepers in a dark room, but I just keep my hands under my blankets or pillows, and I sleep just fine! It doesn't light up all the time, just periodically throughout the night. If the tiny lights at night might bother you, you can probably put a thick sock or a glove over your hand at night to block the light. I'm personally not inconvenienced by it at night, and I like that I can't feel anything when it checks my vitals (heart rate, blood oxygen, temperature, just to name a few). I wound up subscribing to the app anually because I really liked how easy it was to set up and how thorough its analysis was for my overall health. ... show more
Reviewed in the United States on June 13, 2025 by Allison K
    • Wish I bought this sooner
Color: Stealth Size: 10
I’ve had my Oura ring for about 2 weeks now, and so far I love it. I bought a “random” cheaper ring first, because the price tag and subscription for Oura turned me off, but the other one didn’t work. I returned it and figured I’d try this. First off, get the sizing kit. If you try to guess based off of other rings, you’ll probably be disappointed. I sized it off of my pointer finger, with the intent to move it to smaller fingers as I start losing weight. (I have no interest in having to buy multiple rings if I can avoid it.) It can be worn on either hand, so I have lots of options to swap too as I hit my goals. The ring isn’t tiny, but it’s not obstructive. I’ve gotten used to it and it doesn’t bother me at all. I can shower with it on, wash my hands, go swimming…all the things. As for the tech and the app, super user friendly and easy to use. Everything is pretty intuitive and the data that doesn’t automatically make sense comes with explanations. You can see how everything ties together. Its predictive nature is also 2-for-2 for me. It’s reads your data in its entirety and tells you when things are a little off. I got a warning one morning when I woke up, and spiked a fever that evening. It’s also accurately predicted the timing of other things that women may find useful. One of the main reasons for me getting the Oura was to track sleep. In my opinion, it’s been pretty spot on. If I feel like I’ve laid in bed all night staring at the ceiling, my data matches that. If I feel like I passed out as soon as my head hit the pillow, the data matches it. When I wake up feeling super refreshed, and check the app, it says I slept well. When I wake up feeling like crap, surprise! The app says I slept horribly. From there, it sets your activity target for the day - based on how rested your body is. All in all, I am very happy with my purchase. Only regret is that I spent so long deciding if I really wanted it or not. But, I guess the good thing is that it seems like this model (Oura 4) has fixed a lot of problems some of the older models had. Definitely recommend! ... show more
Reviewed in the United States on May 14, 2025 by halipino808
    • Oura is terrific!
Color: Stealth Size: 7
Oura is just what I’ve been looking for in a fitness device—and a lot more. Have been frustrated with previous fitness bands, not very accurate, tiny screens, and need to remove whenever around water. I wasn’t looking for a device that beeps, buzzes, notifies me of calls, emails, etc. Just wanted a reliable , easy to use accurate one. Oura provides tons of data, including basic vitals, steps, detailed sleep analysis , stress levels, and lots of suggestions on how to improve health. It’s waterproof, so I never have to take it off to shower or do dishes. It’s comfortable to wear, and all the data is only available to view on your cell phone, where it’s easy to read. I haven’t yet tried all the great features, including calorie counting. So much to see and learn. I have to charge it about every 4-5 days, not a week as advertised. Charging is fast and easy. Highly recommend! ... show more
Reviewed in the United States on June 7, 2025 by Mary G
    • Difficult fit for accuracy, relatively pricey monthly subscription
Color: Black Size: 7
I invested in this ring mainly for sleep tracking and it’s awesome! It does everything it should and more. Things I don’t understand it explains well and I like “Advisor” for questions and suggestions. My main issue is size, I’m definitely frustrated. Got the size 7 which was supposed to fit well, but my fingers get cold and the ring is too loose. I live in NH so it’s chilly then it’s hot and humid during our Summer months and my finger swells. So, after 2 months of wearing it it’s definitely too big, the return window has closed so I had to eat the money for a size 6, it just doesn’t fit any finger well. Ideally I am a size 6 1/2 but this does not come in half sizes. Fingers crossed the 6 works. Also, I got it in black and it does have a scratch already after 2 months which is super odd as I’m a Nanny, I do no crazy stuff that involves being hard on my ring, not sure how the scratch happened. I also feel the monthly subscription is a bit pricey for an already very expensive ring. The data is valuable but I wish the subscription was cheaper, so be prepared to pay that on top of the cost of the ring. ... show more
Reviewed in the United States on May 24, 2025 by KP1105

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