femometer Ring for Fertility and Ovulation Monitor Tracking - Size First with femometer Sizing Kit - App Auto-Sync - Period & BBT Tracker - Sleep Analysis for Women - Rechargeable & Waterproof Size 8
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- – 6-month term
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30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Size: 8 (2.13-2.22 Inch)
Features
- How to Download APP: For Android users, please search and download "Femometer Connect". For i0S users, please search and download "femometer".
- Fertility Tracking without Disturbing Sleep: Only need to wear it on your finger to monitor your fertility temperature in real time, the APP automatically synchronizes the data and generates customized fertility charts, predicts menstruation and ovulation to help you prepare for pregnancy and manage your period more scientifically.
- High Accuracy & Convenience: Compared with traditional oral thermometers that take a single temperature measurement, the finger ring continuously detects temperature thousands of times a day while you sleep, which greatly improves the convenience of use and the accuracy of ovulation window/period prediction.
- Sleep Monitoring and Analysis: Through the sleep data collected by the app, you will have an in-depth understanding of your sleep condition and the changes in each stage and the app will also give you customized sleep analysis and suggestions to help you improve the quality of your sleep according to your body's natural rhythm.
- Easy to Use: Wear the ring before going to bed, open the App to synchronize the data after waking up, you can view the prediction information and history on the App. When the ring is low, put it on the base to charge, it will be fully charged in less than 2 hours, and you can use it for at least 5 days continuously with one charge.
Package Dimensions : 3.15 x 3.15 x 2.83 inches; 4.97 ounces
Item model number : IRS-101
Batteries : 1 Lithium Ion batteries required. (included)
Date First Available : March 12, 2024
Manufacturer : LOLLIPOP TECHNOLOGY (HANGZHOU) CO., LTD
Country of Origin : China
Frequently asked questions
This product is currently out of stock. Please check back later for shipping info.
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.
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
Learn more about financing & leasing here.
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Top Amazon Reviews
Thank you Femometer for creating a comfortable ring that I can wear to track my period (and sleep) and not requiring (yet another) subscription to use it!! I loved the idea of Oura Ring and Natural Cycles but I couldn't bring myself to spend that kind of money AND have to pay a subscription on top of that. I was thrilled when I found Femometer and saw that the purchase of the ring included a lifetime prime membership for their app. The app is well designed, syncs fast, and has tons of information (and charts for the visual people, like myself). The ring fit is lightweight and comfortable so I've been wearing mine 24/7 (minus shower time, even though it is waterproof). Overall great value for my money!!
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Reviewed in the United States on August 30, 2024 by Jackie French Jackie French
Size: 8 (2.13-2.22 Inch)
They didn’t provide a resolution as promised to it not reading or syncing . Item defective from day 1. Not syncing not reading temp. Won’t even turn on. They keep asking for video of you charging it like you’re not intelligent to get out helping w/ a refund or replacing. They pretended to help in 30 day now I can’t get a refund or anything. I got an expensive piece of junk. A waste of money
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Reviewed in the United States on February 28, 2025 by AMAZON630
Size: 8 (2.13-2.22 Inch)
There's so much to love about the Femometer Ring. The ring itself is comfortable and lightweight, and easily syncs with the app each morning. The price point is affordable and the app is very user-friendly and provides tons of personalized information each day based on where you are in your cycle. The sleep tracking isn't a feature I was looking for, so I was surprised at how valuable I've found it to be. I absolutely love it and the data it provides. Lastly, I had the chance to speak with someone from the company who answered any questions I had and it was easy to tell how much this company cares about what they are doing and the quality of product and service they are providing their customers.
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Reviewed in the United States on September 17, 2024 by crobinson
Size: 8 (2.13-2.22 Inch)
The Femometer ring has been a game-changer when it comes to tracking my fertility while breastfeeding and cosleeping with my toddler. Even with frequent night wakings, my charts are very accurate. The price point is amazing, considering it also comes with lifetime access to the Femometer app, where I can track all other data points related to my cycle. I wear the ring every night, and simply open the app in the morning to sync the data. I have appreciated that Femometer shows me all the data it collects, and helps to analyze it, while also allowing me to make corrections to my ovulation day or flag possibly inaccurate temp data (due to extraneous circumstances) if I see fit.
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Reviewed in the United States on January 21, 2025 by Rachel Rachel
It was awesome for the first 28 days and really interesting to see the app’s insights and tracking. However, on day 29 it suddenly wouldn’t connect. I thought it was a one off and put it on the charger and tried again the next night and it still won’t connect. I’ve emailed customer support but haven’t received a response yet. To be fair it’s only been about 8 hours since I sent the email. I’ll update if a resolution is reached or the ring begins to work again. At this point, it’s not worth the money if it only works for 28 days.
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Reviewed in the United States on August 26, 2024 by Emily B.
Size: 8 (2.13-2.22 Inch)
My ring would not turn on or connect from the start. I contacted customer service after troubleshooting every possible solution. They required a list from me to prove their product was defective, fine, but then told me they had to replacements available in my size at this time and would follow up once they did. Haven't heard back in 2 weeks so I followed up and got an out of office response letting me know they'll be out another week. Beyond frustrating. When TTC every day counts and they clearly don't care.
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Reviewed in the United States on January 26, 2025 by alex
As someone who had a hysterectomy at a very young age, I would consider myself to be quite far outside of the Femometer Ring for Fertility Tracking’s target demographic. I haven’t bled in nearly a decade—I don’t even have a cervix! But I still have a hormonal cycle, and trying to track it in any meaningful sense felt like an uphill battle. Being a bit of an edge case, I wasn’t sure if the ring would be helpful for me or not. Lo and behold, I’m finally getting consistent BBT readings and insights that I can make sense of!!!! The app’s interface is intuitive and easy to use, the symptom tracking features are customizable, and the resources and infographics I’ve viewed are well-made. As others have mentioned, the ring comes with a lifetime premium subscription to the app, and it’s clear from the interactions I’ve had with this company that they care deeply about their customer base and the work that they do.
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Reviewed in the United States on November 20, 2024 by Kie
Size: 8 (2.13-2.22 Inch)
It’s comfortable and appears to be pretty accurate at tracking bbt. It very convenient to stick it on at night and then plop it back on the charger in the morning. It doesn’t have much more functionality than tracking bbt and sleep and you do have to open the app to sync it. The app was a bit glitchy at first but after some updates it appears to be working fine. It is more expensive than other wearable bbt devices but for the added convenience and helpful (free) app, it was worth the money to me.
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Reviewed in the United States on February 12, 2025 by Ameena Khan