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femometer

femometer Smart Ring Gen2 Ceramic | Sleep, Heart Rate & Cycle Monitoring with Free Subscription | Women's Health & Fertility Tracker with BBT Technology | Size Before You Buy - Size 10

  • Based on 261 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Aug 11
Order within 16 hours and 50 minutes
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Color: Gold


Size: Size10


Features

  • 24/7 HEALTH COMPANION: Continuous heart rate monitoring and HRV tracking provide stress insights and health trends. Track daily activity, steps, and calorie burn. All health data syncs seamlessly with the lifetime free femometer app.
  • PROFESSIONAL SLEEP INSIGHTS: Track sleep stages (Deep, Light, REM), blood oxygen levels while you rest. Get detailed sleep scores and personalized recommendations.
  • ADVANCED CYCLE TRACKING: Revolutionary BBT technology with 1,400+ nightly temperature measurements provides accurate cycle predictions and ovulation detection. Part of trusted femometer ecosystem with 15M+ women worldwide.
  • COMFORT MEETS ELEGANCE: Just 2.7mm. Premium ceramic exterior with aluminum core ensures durability while weighing only 3.3g. Scratch-resistant, water-resistant to 100m, and designed for 24/7 wear. Size First with femometer Sizing Kit.
  • SIMPLE & RELIABLE: Up to 35-day battery life with quick charging case (stores 5 full charges). Pair with femometer app to get lifetime subscription. Compatible with iOS and Android. Includes 1-year warranty and dedicated customer support. Regular firmware updates ensure continuous improvement.

Description

Continuous HRV tracking provides heart rate monitoring, Femometer Ring Gen2 helps you focus on your heart health and seamlessly with the free Femometer app. Professional sleep insights, track sleep stages (Deep, Light, REM) while you rest. Get detailed sleep scores and personalized recommendations. Femometer Ring Gen2 provides stress insights, reminds you that you are in a tense state now, and proper relaxation is more beneficial to your health. 24/7 health companion, steps, can count steps and calculate calories burned.Get real-time alerts when it's time to move or rest. Advanced BBT Technology, 1,400+ nightly temperature measurements Provides accurate cycle predictions and ovulation detection, smart algorithm helps identify and track ovulation.

Operating System: Wear OS 3.0


Special Feature: Activity Tracker, Cycle Tracking, Lightweight, Wireless Charging


Battery Capacity: 21 milliamp_hours


Connectivity Technology: Bluetooth


Wireless Communication Standard: Bluetooth


Battery Cell Composition: Lithium Ion


GPS: No GPS


Shape: Round


Screen Size: 1 inches


Brand: femometer


Operating System: Wear OS 3.0


Additional Features: Activity Tracker, Cycle Tracking, Lightweight, Wireless Charging


GPS Geotagging Functionality: No GPS


Band Material Type: Ceramic


Water Resistance Level: Water Resistant


Supported Application: femometer app


Water Resistance Depth: 100 meters


Metrics Measured: Heart Rate Monitor, Sleep Duration, Blood Oxygen Monitor, Body Temperature


Shape: Round


Style Name: Ring Only


Color: Gold


Battery Capacity: 21 milliamp_hours


Battery Cell Type: Lithium Ion


Screen Size: 1 inches


Display Type: No Display


Item Dimensions D x W x H: 0.11"D x 0.11"W x 0.11"H


Brand: femometer


Model Number: B0FVSNHC6F


Built-In Media: User Manual


Warranty Description: 1 Year Manufacturer


Wearable Computer Type: Smart Ring


Unit Count: 1 Count


UPC: 810115237594


Manufacturer: LOLLIPOP TECHNOLOGY (HANGZHOU) CO., LTD


Connectivity Technology: Bluetooth


Wireless Compability: Bluetooth


Communication Feature: Bluetooth


Compatible Devices: Smartphone


Compatible Phone Models: Compatible with iOS and Android devices


Warranty Type: Standard


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Aug 11

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

    • Sleek design with surprisingly powerful features
Color: Gold Size: Size9
I’ve been really impressed with this smart ring so far. It looks sleek and minimal, but it packs a lot of useful features, especially for sleep and health tracking. The ring is lightweight and comfortable to wear all day and night—I barely notice it’s on, which makes it perfect for sleep tracking. The ceramic finish also gives it a premium look and feels very durable. The data it provides is clear and helpful, especially for tracking sleep quality and overall activity. It’s nice to have something more discreet than a smartwatch while still getting meaningful insights. Battery life has been solid, and charging is simple and quick. The app is also easy to use and makes it easy to understand your stats without feeling overwhelming. Overall, this is a great option if you want a stylish, low-profile wearable that still delivers on performance. Definitely worth it. ... show more
Reviewed in the United States on April 7, 2026 by Shelby
    • This would have gotten a 5! but... get the Ring Air. and its a 5!
Color: Gold Size: Size7
I love the application that comes with the ring, and I love the capabilities of the right, but the ring itself, constructed, is poor. the white outer part cracked within 3 months of buying it. and a month and half later it completely detached from the ring. Now does the ring still work? yes. I contacted customer service for Femometer and they refunded my money so I upgraded to the ring "Air" which so far appears to be a better construction. I would have given this ring a 5 if it didn't break. truly love Femometer and what it offers. The app is free and I love the functionality. its only getting 4 because the ring it self broke, and I had to upgrade to the newer model within 5 months. but customer services refunded me so it cost me nothing to upgrade!! It fits great and keeps track of my sleep, my cycle, my heart .. love it! ... show more
Reviewed in the United States on July 9, 2026 by Kels
    • Really wanted this to work...
Color: Gold Size: Size9
I wanted to love this ring so bad! It fit nicely and had great insights, however, I ended up returning it. The ring only detected blood oxygen levels the first day. Then it stopped working. The batter was losing 25-30% per day. This means it will NOT last even 5 days. This was a crucial part for me in deciding to return it. Plus it says water resistance 100m, BUT the user manual says to NOT wear it in the pool, shower, bath etc. and its only ok to keep on when washing your hand. So that makes it less useful for me. Other than all that the items that work were accurate. ... show more
Reviewed in the United States on May 28, 2026 by Nishell Kolb
    • Happy Camper!
Color: Gold Size: Size9
5 month update: Wanted to give a quick update now that I’ve owned this ring for 5 months- I am still loving it! It even helped me track my cycles and I can happily say my husband and I are currently expecting our first baby due in February! I haven’t had any glitches or connection issues. The battery is still holding strong too. It now has some slight wear and tear on the bottom side of the ring where the gold is beginning to wear off, but it goes unnoticed when looking at it from the back of my hand. Still think this is a fantastic purchase! Original review: Super happy with my purchase. I was a little skeptical with all the negative reviews but I’ve had my ring for a few weeks now and I can say I am happy with my purchase. I absolutely love the color and look of this ring. You don’t see very many white smart rings on the market. The tracking is accurate and I enjoy the extra content you get within the app. I think this is just as good if not better than more expensive rings on the market! A lot of other rings don’t include cycle tracking without purchase of other apps. Best all in one ring for females! ... show more
Reviewed in the United States on May 13, 2025 by Katrina Minard
    • Cheap quality not worth the price tag
Color: Gold Size: Size9
If I could give a zero I would. I had this ring for a month literally and the outside ring cracked, I don’t do any heavy lifting or anything with it on. Then I went to take it off and the whole outer portion just came off leaving the inner portion of the ring still on my finger. It also doesn’t do anything unless you constantly sync it. So in order for it to even register your bbt you have to go into the app everyday every morning and the whole point in buying this was so that I wouldn’t have to go into an app and input this stuff. Also the battery is terrible last 3 days at the most. Don’t waste your money it’s not worth it. Just buy and Oura ring… ... show more
Reviewed in the United States on August 10, 2025 by Destany & Thomas
    • amazing product!!
Color: Gold Size: Size8
loooove this product so much! my femometer has changed the game for me when it comes to tracking my cycle and other health data. it is very easy to use and is so accurate! typically, for biometric rings it is advised to wait at least 60 days after purchase for accurate female data, however, my femometer has been accurate since the very start! that impressed me right off the bat. it holds a charge for up to 4-5 days and then when you put it in the charging case it charges fully within a couple hours! i love how slim the ring is. it is very comfortable and most of the time i barely even notice that i’m wearing it. i love that there is no app subscription. i would 100% recommend this to any woman who wants to track their cycles or even just their sleep/health data. ... show more
Reviewed in the United States on July 17, 2025 by Joseph
    • First one didn’t last a year. Second didn’t even last 2 months
Color: Gold Size: Size7
I purchased my first ring back in May. It was working great and I loved it! It tracked everything perfectly, and it tracked everything I wanted. The battery worked fine for a while, then I noticed it needed to be charged almost every other day. In October I noticed a crack along the top of the ring, this was confusing because I was never rough with it. It worked for a few weeks after that and then suddenly stopped working, wouldn’t charge. I reached out and customer service was great and even sent me a replacement. The replacement they sent me came mid November. Within the first week I had trouble with charging. Eventually I fixed it by switching the charging port out with a different one. This worked until December 22nd. I reached out again to customer service after the holidays and they told me there was nothing they could do. They ended up offering me a refund which I took, but if I were being honest.. while this ring does have great features.. looks sleek, tracks everything without a subscription, company has decent customer service despite them being hard to reach.. I’d say save your money and buy the oura. I love the concept of what they’re doing, I just feel like there’s a lot of work to be done to actually get it done right. I feel like if they do that they’ll have a lot of sales. I really wish my ring worked because I did like it and felt like the tracking was accurate. ... show more
Reviewed in the United States on January 16, 2026 by Alexis
    • Amazing ring!!
Color: Gold Size: Size11
I have had this ring since March and I absolutely love it. It’s like a personal assistant when it comes to your health, try to conceive, and tracks your cycle. This ring have been a great game change for me and I would recommend this to anyone.
Reviewed in the United States on June 2, 2026 by Sweet T914

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