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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 9

  • Based on 149 reviews
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$189.00 Why this price?
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Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon
Arrives Saturday, May 30
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Color: Gold


Size: Size9


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.

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: Metal


Water Resistance Level: Water Resistant


Human Interface Input: Touchscreen


Supported Application: Fitness Tracker, Heart Rate Monitor, Sleep Monitor


Water Resistance Depth: 1.5 Meters


Metrics Measured: Blood Oxygen Monitor, Body Temperature Monitor


Shape: Round


Style Name: Ring Only


Color: Gold


Battery Capacity: 21 Milliamp Hours


Battery Cell Type: Lithium Ion


Battery Average Life: 7 days


Screen Size: 1 Inches


Display Type: No Display


Item Weight: 4 Grams


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


Brand: femometer


Target Audience: Girls, Women


Model Number: Gen2


Built-In Media: User Manual


Warranty Description: 1 Year Manufacturer


Wearable Computer Type: Smart Ring


UPC: 810115236412


Manufacturer: LOLLIPOP TECHNOLOGY (HANGZHOU) CO., LTD


Unit Count: 1.0 Count


Connectivity Technology: Bluetooth


Wireless Compability: Bluetooth


Communication Feature: Bluetooth


Compatible Devices: Smartphone


Compatible Phone Models: All current iPhone models, All current Android models


Warranty Type: Standard/Full


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, May 30

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
  • PayTomorrow Financing
  • 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

    • 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
    • Easy use
Color: Gold Size: Size8
I love this ring. The color combination gives it a feminine look. It is very comfortable and light weight. The free app is easy to use and informative. My cycle tracking and predictions are accurate. The batter life is super with charging during showers. The connectivity and speed of sync is great. This is a great functioning ring! ... show more
Reviewed in the United States on January 20, 2026 by Jennifer Eklund
    • Ring
Color: Gold Size: Size11
Honestly, ended up returning the ring. I had charging issues and it caused quite a bit of frustration when trying to get it to charge. Finally randomly, it just started working so I’m not sure if it was user error or what.. Still giving 3 stars because it DID do what it was supposed to do - measured my BBT and tracked basic health data. It took me a while to figure out the setup in the app but once I got it, it was fine. It looks good and the size felt fine but honestly I still preferred just manually taking my temp and using my Premom app to track the temp. The health data was useless to me because I have a garmin. For the money, I just didn’t find it worth it. ... show more
Reviewed in the United States on March 19, 2026 by Christina Frisch
    • Great product, easy app, good for all ages
Color: Gold Size: Size6
Lightweight, great app functionality. Good customer support with fast chat help to get my synced up as a new user. Easy to use, tracks more than I need, pretty accurate (sleep and stress sections questionable but hoping the new release will help) I use this as a fitness tracker and do not use the fertility components and it's great. I've used it for 2 months and it does have small black marks on it.... ... show more
Reviewed in the United States on March 5, 2026 by Lauren M.
    • the device failed to deliver on its core function
Color: Gold Size: Size10
After two months of consistent nightly wear, the thermometer ring’s BBT tracking feature reports my data as inconsistent—despite wearing the ring every night as instructed. This undermines the entire value proposition. When I compare results to my Apple Watch sleep data, the ring consistently underreports my sleep duration. Most importantly, I’ve been unable to identify an ovulation pattern using this ring, whereas manual BBT tracking with a traditional thermometer over the same period clearly showed my cycle pattern. A device designed to simplify fertility tracking should make detection easier, not harder. For the price point, this isn’t delivering on its core promise. I’m requesting a refund. ... show more
Reviewed in the United States on April 5, 2026 by Stasia Lyons
    • 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
    • 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

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