FKGZJF

FKGZJF Smart Health Rings for Women Men Fitness Tracker with Heart Rate Blood Oxygen HRV Sleep Tracker Step

114+ bought in the past month

$5.99$119.99

About this item

  • 💎 Why to buy the Ring Sizing Kit? Many people measure the ring size by a string or a paper, and wrap it around the finger, then mark it by a pen to measure the length to decide the ring size, but most of them got the ring with wrong size, some are too big, some are too tight. so we design this Ring Sizing Kit to help our customer to find the perfect ring size.
  • 💎 Designed for Precision: The FKGZJF Ring Sizing Kit is specially crafted to ensure accurate finger size measurement for a perfect fit with FKGZJF smart rings. it's only for the FKGZJF smart ring, not for other smart ring brands.
  • 💎 Easy-to-Use: You just need to choose one or more sizing gauge to wear on your finger, then you will find the most comfortable size. we recommend you to wear the suitable sizing gauge for 24 hours. The sizing gauge should fit your skin gently, neither too tight to cause discomfort nor too loose to slip off easily.
  • 💎 Comfortable Material: Made with high-quality, skin-friendly materials, our sizing kit ensures a smooth and comfortable measuring experience.
  • 💎 Exclusive Compatibility: This sizing kit is uniquely designed to work exclusively with FKGZJF smart rings, providing the best fit and performance for our smart ring. This sizing kit is suit for both men and women, you can use this sizing kit to find the right size for all of your families, then you can buy a FKGZJF smart ring with perfect size for yourself, your husband, wife, father, mother, boy friend, girl friend etc.
  • 💎【Long Battery Life】: The FKGZJF Smart Ring has a battery life of up to 3-5 days on a 2 hrs charge. We offer a free portable charging case with 400 mah battery, it can fully charge the smart ring for about 15 times, which greatly extending the usage time to 60 days. You can also charge the charging case, then you can use it to charge the smart ring 15 times again. Ideal for frequent business travelers and outdoor enthusiasts, ensuring continuous health monitoring no matter where you are.
  • 💎【Easy to Charge and Wide Compatibility】: Simply charge the smart rings for women men with a magnetic USB cable or the charging case. The smart rings for women men are compatible with Android 4.4 / iOS 8.4 or above smart phones. What you get includes: FKGZJF smart ring *1, 400mah charging case*1, magnetic USB charge cable*1, type C charge cable(for charging the charge case)*1 and instruction*1. This ring tracker is a great gift for men and women.
$5.99
Was $119.99Save $114.00

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Sold bySheng Paladin
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Product details

Special FeatureLightweight
Connectivity TechnologyBluetooth
Wireless Communication StandardBluetooth
Battery Cell CompositionLithium Ion
GPSNo GPS
ShapeRound
BrandFKGZJF
Model NameSmart Ring
StyleModern
ColorSizing Kit

Technical specifications

package_dimensions6.1 x 5.67 x 1.1 inches
item_weight0.09 Kilograms
item_model_numberSmart Ring
batteries1 A batteries required. (included)
best_sellers_rank#7,823 in Electronics ( See Top 100 in Electronics ) #31 in Smart Rings
date_first_availableJanuary 10, 2025
manufacturerDuobuy

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Customer reviews

4.4339 ratings

Customers say

Customers find the smart ring tracks heart rate and sleep accurately and is easy to use with a user-friendly app.

★★★★★

Easy to use, comfortable, monitors sleep

Thomas M SissonJanuary 9, 2026

Ordered kit for proper size. Works great, gives heart rate accurately, steps a little off iPhone, Bought mostly to monitor sleep and that gives good information. App was easy to set up and link. Battery is good and lasts several days. Read more

★★★★★

Excellent Smart Ring With Premium Features—No Monthly Fee

Crystal SJanuary 14, 2026

I am extremely impressed with this smart ring. It offers all the same core features as the much more expensive name-brand versions, but at a fraction of the cost, and without a monthly subscription fee, which is a huge plus. I’ve found the data to be very accurate when compared to my expensive smartwatch. The biggest advantage for me is sleep tracking: I have to charge my watch at night, so I was missing that data, but this ring allows me to track my sleep effortlessly. It also tracks oxygen levels and HRV, which my smartwatch doesn’t even offer. The ring is very comfortable to wear. I honestly forget it’s on and it’s waterproof, so I never have to worry about taking it off. Charging is incredibly convenient too. I can just drop it in the charging case while driving to work every few days, and the app clearly shows the battery life so I always know when it needs a charge. Overall, this ring has been a great tool for keeping my health on track. If you want comprehensive health tracking without the high price tag or monthly fees, this is an excellent choice. Highly recommend. Read more

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★★★★★

Knowing my BP and sleep patterns are important to me

Dr. Jim KayDecember 29, 2025

I'm wanting to track my sleep as well as my blood pressure and this did both. I put images in the review so you can see exactly what the app and results look like when you wear it, and how the readings change throughout the day. Why I Bought It The doctor told me my blood pressure was running high, so I needed an easy way to see if I was hitting dangerous levels at different times of day without constantly using a traditional cuff. I also wanted a simple, comfortable sleep tracker that I could wear all night without the bulk of a smartwatch or fitness band. Health Tracking Performance This ring tracks heart rate, blood oxygen, HRV, stress/pressure levels, and sleep, giving you a clear picture of how your body is doing in one dashboard. The blood pressure–related insights and alerts make it much easier to notice patterns, like when stress or activity causes spikes, so you can bring real data to your doctor. Sleep And Daily Insights Overnight, it records how long you sleep and breaks it into stages, then shows trends so you can see how habits like staying up late or drinking caffeine affect your rest. During the day, step and activity tracking help you connect movement with better sleep and calmer heart-rate/pressure patterns over time. Design, Comfort, And Colors The ring is slim, lightweight, and much less noticeable than a watch, so it feels natural to wear all day and night, even while sleeping. It is waterproof, so you do not have to take it off for handwashing, rain, or most daily water exposure, and it comes in multiple colors so you can pick a style that matches your jewelry. Overall Impression For the price, getting heart rate, blood oxygen, HRV, stress, sleep, steps, and blood-pressure-related tracking with no subscription fee is an incredible value. Anyone who has been warned about high blood pressure or who wants deeper insight into sleep and daily recovery would find this ring extremely helpful and reassuring. Get the proper fit. It must be snug. Read more

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★★★★★

Great smart ring, comfortable and easy to use

Maikro MesaJanuary 8, 2026

The media could not be loaded. Very happy with this smart ring so far. The setup was quick and simple, and it connected to my phone without any issues. The ring feels lightweight and comfortable to wear all day, and the design is clean and discreet. The packaging includes everything you need, and the charging case works well. For the price, this smart ring delivers solid performance and is a great alternative to bulkier wearables. Highly recommended if you’re looking for a simple and practical smart ring. Read more

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★★★★☆

Easy to use app.

DanJanuary 1, 2026

It seems to work well. Only 4 stars because I don’t know how accurate it really is. I don’t really have a way to compare it to the more expensive rings on the market. Read more

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★★★★★

Stylish, comfortable, and surprisingly accurate Smart Ring — tech meets elegance!

EvgeniyaOctober 13, 2025

I’ve been testing this Smart Ring for a few days and I’m honestly impressed! The design is sleek and minimal it looks like a stylish piece of jewelry, not a gadget. It’s lightweight, super comfortable, and fits perfectly on the finger (I wear size 8). The sensors track heart rate, sleep, and activity quite accurately, and the connection with the app was smooth and quick. I love that it charges easily in its compact case and holds battery for several days. It’s a great option for anyone who wants to monitor health without wearing a bulky smartwatch. Definitely worth trying! Read more

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★★★☆☆

Get this set before ordering a Smart Ring....and then the ring

Dave A.July 19, 2025

Glad I got this set. It provided me the right size I needed for my Smart Ring, and prevented me from getting the wrong size. This saves the guess work, and worth the few bucks to find out the size I really needed. After getting the Smart Ring, and being blocked from doing a review on it, I've added it here, so beware of these APPs (see pics). The Apps want full access to your phone, your text messages, photos, and contacts, and...access to DELETE your contacts. How's that for something you want to have on your phone? Even if you opt out, whose to say they still don't have access? I'm not sure what the charging block is for either, as I used it to charge the ring, and it showed fully charged, then used the magnetic cord to charge the ring directly, and it charged for another 2 hours...so what's the block for? As for accuracy of the ring, it's understood it's for reference only, so don't take it as official tracking. I use mine basically for sleep, and it's not bad, but it's way off for blood pressure. Steps are close, but not great. The SP02 reading is fairly accurate as well. I tested this against my other meters for verification. The App is from China, so you are giving them access. Read the Privacy Policy. Read more

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