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femometer

femometer Smart Ring Gen2 - Sleep, Heart Rate & Cycle Monitoring - Free Subscription - Women's Health & Fertility Tracker with BBT Technology - Size Before You Buy - Up to 7 Days Battery Life - Size 9

  • Based on 71 reviews
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$199.00 Why this price?

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This item is eligible for return within 30 days of receipt

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: 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: Cycle Tracking, Activity Tracker


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


Package Dimensions: 3.2 x 3.2 x 2.4 inches


Item Weight: 0.141 ounces


Item model number: Gen2


Batteries: 2 C batteries required. (included)


Date First Available: September 27, 2024


Manufacturer: LOLLIPOP TECHNOLOGY (HANGZHOU) CO., LTD


Country of Origin: China


Item Weight: 4 Grams


Standing screen display size: 1 Inches


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.

  • 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

    • Great smart ring
Size: Size9
Love this ring! I got it to track my cycle because I have PCOS. It's very easy to use. The battery on it is great. I love that I can see how I slept and what to except in my cycle.
Reviewed in the United States on March 20, 2025 by Ally
    • Easy to wear and helpful!
Size: Size7
Review Image by Shelby Reiss Shelby Reiss
I purchased this ring after having some health issues and needed a way to track my heart rate without breaking the bank. I love this ring and it is sleek and does not bother me during the day and sleeping.
Reviewed in the United States on April 16, 2025 by Shelby Reiss Shelby Reiss
    • Not for perimenopause tracking. Get the sizing kit
Size: Size9
This didn't fit me true to size, so I suggest getting their sizing kit and making sure you have the correct size before you begin. And, just to be clear, this is very much geared towards women trying to get pregnant. I thought the features would be just as useful for tracking perimenopause, but unfortunately it's just really not useful for that at all, so I am back to manually tracking with my GCal app. I do think the app and tracking capabilities seem to work well and would have been very useful for fertility tracking for pregnancy. ... show more
Reviewed in the United States on April 8, 2025 by Gen
    • Unless Your trying to conceive, not worth your money
Size: Size8
More so for women who are trying to have a baby. The sleep/stress/heart rate, etc is minimal and it didn't even work.
Reviewed in the United States on May 29, 2025 by Gabrielle
    • Don’t buy unless you wanna only use it for a month
Size: Size9
It was cool when it worked. I had it for a month and it has stopped syncing. I’m rather annoyed I spent this money to figure this out. I hope their customer service can help get it working or will replace it.
Reviewed in the United States on February 23, 2025 by After about a month it stopped connecting. I hope customer service can help me or replace it, but I’ll be rather annoyed if I spent this money for only one month.
    • Happy Camper!
Size: Size9
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
    • Ring.
Size: Size8
I love it so far. Even though the battery is being drained pretty fast.
Reviewed in the United States on May 31, 2025 by Trisha shifflett
    • Size chart is way off
Size: Size7
It’s been tricky to find the correct size, definitely recommend getting the size kit vs going off of their size chart. So far the ring has functioned well, but I’ve only had for a couple of weeks. The charging gives me trouble sometimes but it hasn’t become too much of an issue (yet)
Reviewed in the United States on May 6, 2025 by Dani

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