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Free Shark

Smart Ring with Sleep Monitoring, Step Counting, Heart Rate, Blood Oxygen for iOS and Android, No Subscription Fee, IP68 Waterproof Health Tracker (Rose Gold, 8)

Condition: New
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$99.99
Save $40.00 was $139.99

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  • – 6-month term
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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Nov 5
Order within 21 hours and 21 minutes

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At a glance

Condition
New
Color
Rose Gold
Size
8
Screen size
1 in
Operating System
AsteroidOS
Special Feature
Activity Tracker
GPS
GPS Via Smartphone
Works with
Smartphone

Features 6

  • Check the Size Before Purchase Before buying the Free Shark Smart Ring, we strongly suggest that you refer to the size chart and carefully measure the circumference of your finger. This will ensure you get the most comfortable wearing experience and easily avoid any unnecessary returns or exchanges.
  • Intelligent Sleep Tracker, Caring for Your Health This Free Shark fitness ring is like a considerate little assistant for your sleep health. It will accurately monitor the quality of your sleep, and record in detail the durations of deep sleep and light sleep, as well as the specific situations of your wakeful states. You just need to open the app at any time, and you can clearly view all kinds of sleep indicators. Then, according to the professional reports, you can easily adjust your lifestyle to embrace better-quality sleep.
  • Diverse Health Monitoring, All-round Protection The Free Shark Smart Ring has a variety of powerful health monitoring modes. Whether it's running, walking, hiking, cycling, yoga, dancing, skipping rope or other sports, it can automatically and accurately track key data such as the exercise route, exercise time, steps taken, heart rate, speed, calories burned and exercise distance in the app. Moreover, it can continuously track important health data such as heart rate and blood oxygen throughout the 24 hours of the day, protecting your physical health in an all-round way.
  • 80-meter Waterproof, Suitable for Various Scenarios The Free Shark Smart Ring has excellent waterproof performance, with a waterproof depth of up to 80 meters. Whether it's for daily wear, an intense workout session or a pleasant swimming time, it can handle it with ease. What's more, even if you have sensitive skin, you can still enjoy an extremely comfortable wearing experience when wearing this ring.

Specs 30

Operating System AsteroidOS
Special Feature Activity Tracker
Connectivity Technology Bluetooth
Wireless Communication Standard Bluetooth
Battery Cell Composition Lithium Ion
GPS GPS Via Smartphone
Shape Round
Screen Size 1 Inches

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Nov 5

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

Game-Changing Wearable Sleek Ring Tech
I recently purchased the Duobuy Smart Ring in size 9 (black), and it’s hands down one of the most impressive wearable tech purchases I’ve made. Right out of the box, the ring felt lightweight yet durable, with a modern, minimalist design that doesn’t scream “tech gadget” – it just looks like a stylish accessory. What I Love: 1. Comprehensive Health Tracking This little powerhouse offers round-the-clock health monitoring, and I mean everything. Heart rate, blood oxygen, sleep quality, steps, distance, and calories – all tracked seamlessly and accurately. It’s like having a personal health dashboard on your finger. 2. Intuitive Air Gestures & Remote Control The air gesture feature is futuristic and fun. I use it to flip through TikTok, control music, take remote photos, and even scroll through e-books. It adds a level of convenience and cool factor I wasn’t expecting in a device this compact. 3. Battery Life & Charging Case The ring lasts 3–5 days per charge, and the included charging case is a game-changer. With up to 15 full charges stored, I’ve basically gone weeks without needing to plug anything in. Perfect for travel or just day-to-day use. 4. Waterproof Durability (IP68) I never take it off – showers, washing dishes, even the pool. No issues at all. The IP68 waterproofing lives up to its promise. Pro Tip: Do yourself a favor and get the Duobuy sizing kit before you order. I did, and the size 9 fits like a glove. No need for returns or exchanges. Final Verdict: This ring is a brilliant fusion of fashion and function. If you want to stay on top of your health without strapping on a bulky watch, this is the way to go. Stylish, smart, and surprisingly powerful – highly recommend! ... show more
Reviewed in the United States on April 10, 2025 by BFM
Great little ring
Color: Black Size: 10
Review Image by Jack
Review Image by Jack
I am pleasantly surprised and pleased with this... 1. Much more affordable than the leading oura 2. No subscription fee 3. The app is a bit funky with translation but very easy to use 4. Battery life is awesome. I have had it on for 2 days, and still 86% left 5. Pretty darn accurate with heart rate, BP, sleep, and spO2. 6. Super comfortable. 7. Wore it to shower, work out, daily hand washing. So far no issues It is really a budget friendly version of the smart rings...and works great so far! ... show more
Reviewed in the United States on March 12, 2026 by Jack
I love my smart ring and it’s pretty too
Color: Rose Gold Size: 7
The media could not be loaded. I love my new ring. Not only is it smart, it’s very nicely made. It’s fits just right and you don’t feel any of the sensors. The charging dock is easy to use also. There is no subscription for it, I love that. The app is free. Be sure to get your correct ring size. The tracking is correct and it also tells me about my sleep quality. Overall I love how well it functions. ... show more
Reviewed in the United States on March 6, 2026 by Laura Rodriguez
Pleasantly surprised
This is such a nice smart ring. It’s quick to charge. The battery has a decent lasting life. The charger is super easy and small easily carried in your purse or in luggage if you’re traveling to ensure that you keep a good charge. The smart ring track your health. I’m sure there’s a way that would also track sleep and things and you can probably even link them to items like Apple health or possibly even you’re my chart account with your doctors office. The value for the money is very good. They are currently comparing my sleep study to it to see how accurate it actually is so we’ll probably update it a later date. It looks nice it’s stylish. I did receive the black one which is what I wanted. I would advise to know your ring size and if your hands tend to swell, remember to size up a little Bit ... show more
Reviewed in the United States on May 18, 2025 by Klapn
smart ring
Color: Silver Size: 11
I bought this ring for my dad so he can monitor his heart rate, stress levels, and glucose. I was truly impressed by all the functions it has and how easy it is to connect.
Reviewed in the United States on March 9, 2026 by Janet y Jorge
The App does not work!!!!!!
Color: Rose Gold Size: 8
Initially I loved the ring, everything was smooth and easy set up. I wanted to love this so much but I wasnt able to wear the ring for even a week. This product uses the Smart Health app, after a couple of days the app crashed and would not open/load. I had to uninstall and reinstall the app causing me to lose all my data. The app then worked for maybe a day and then crashed again and would not open/load. I do not recommend this product due to the app crashing constantly. The app also has horrible reviews in the play store and I wish I knew this before purchasing. ... show more
Reviewed in the United States on March 26, 2026 by Jesse Santistevan
Sleek, comfortable, works!!
I bought this smart ring for my husband and he’s genuinely impressed. It looks just like a sleek, modern ring, but it’s packed with features. He uses it daily to track his sleep, heart rate, and activity, and the data has been surprisingly accurate. The battery lasts several days, and the app is easy to use and understand. It’s comfortable enough to wear all day, and he loves that it doesn’t look like a typical piece of tech. The ring also has, a cute case to keep it in! This was a great gift and absolutely worth it!! ... show more
Reviewed in the United States on May 21, 2025 by Alayna
Sleek, Functional, and Surprisingly Useful!
I wasn't sure what to expect with this smart ring, but it completely exceeded my expectations. The black finish looks sleek and modern—perfect for everyday wear—and it's lightweight enough that I forget I'm even wearing it. Pairing it with my phone was quick and simple, and the functions work exactly as advertised. I love being able to unlock my phone, control apps, and share contact info with just a tap. It’s a great blend of style and tech, without being flashy. If you're into smart accessories or just want a discreet way to access some helpful features, this ring is a great buy. Highly recommend it! ... show more
Reviewed in the United States on April 30, 2025 by Mayireny
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