--- product_id: 34871126 title: "YONO Fertility Monitor, Sea Foam" brand: "yono" price: "¥37725" currency: JPY in_stock: false reviews_count: 8 url: https://www.desertcart.jp/products/34871126-yono-fertility-monitor-sea-foam store_origin: JP region: Japan --- # YONO Fertility Monitor, Sea Foam **Brand:** yono **Price:** ¥37725 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** YONO Fertility Monitor, Sea Foam by yono - **How much does it cost?** ¥37725 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/34871126-yono-fertility-monitor-sea-foam) ## Best For - yono enthusiasts ## Why This Product - Trusted yono brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Product Description YONO is the only wearable earbud to measure Basal Body Temperature, which may be used in predicting ovulation, natural family planning and understanding female hormonal health. YONO provides a seamless and effortless solution to get your BBT data. Simply wear YONO earbud during sleep - everything else is taken care of by YONO! From the Manufacturer Sorry, this video is not supported on this browserPlay VideoPlayMute0:00/0:55Loaded: 0%0:00Progress: 0%Stream TypeLIVE-0:55 Playback Rate1xChaptersChaptersDescriptionsdescriptions off, selectedCaptionscaptions settings, opens captions settings dialogcaptions off, selectedAudio TrackFullscreenThis is a modal window.Beginning of dialog window. Escape will cancel and close the window.TextColorWhiteBlackRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentBackgroundColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentTransparentWindowColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyTransparentSemi-TransparentOpaque">Font Size50%75%100%125%150%175%200%300%400%Text Edge StyleNoneRaisedDepressedUniformDropshadowFont FamilyProportional Sans-SerifMonospace Sans-SerifProportional SerifMonospace SerifCasualScriptSmall CapsReset restore all settings to the default valuesDoneClose Modal DialogEnd of dialog window. Fertility tracking with YONO earbud and YONO Fertility APP YONO earbud and YONO Fertility APP work together to make fertility tracking simple and easy. Overnight continuous body temperature readings YONO provides overnight, continuous body temperature readings. Users can either use BBT provided by YONO APP, or manually input BBT data in the APP. No data transmission during sleep No data transmission when worn every night; the data only syncs when the earbud is in the base station. Comfortable silicone encased YONO is a comfortable, silicone encased earpiece (similar to an phone or music earbud) that ensures the material in touch with the skin is not irritated and is always comfortable. Charting BBT - seamlessly and effortlessly In the morning, after wearing YONO during sleep, you may sync data with a smartphone to get overnight temperature data. You know your body with YONO Based in Silicon Valley, YONO Labs was founded by a group of engineers and entrepreneurs passionate about changing the way people collect and use data. We want to empower women by providing relevant, revolutionary data about their body. About the Startup Describe your product in 3 words. YouKnow with YONO How did you come up with the idea for this product? The idea of YONO comes from our own experience. Two of our team members had the experience of trying to use BBT data to get pregnant as suggested by our OB/GYN. We found the process very painful and frustrating. Many days, we forgot to measure or record needed data before we got up. Other days, we forgot to prepare a bedside thermometer before sleep. So, for women like us, we wanted to solve the problem of collecting data. What makes your product special? YONO makes charting BBT seamless and effortless. Measuring and recording body temperature continuously during sleep, YONO earbud provides actual basal body temperature (BBT) data for users. YONO earbud creates an enclosed and controlled environment in the ear canal so that the reading is not affected by room temperature. When used for longer periods of time, the YONO Fertility APP will increase accuracy in predicting ovulation windows. What has been the best part of your startup experience? Building the world's smallest and first wearable in-ear device was definitely a great achievement. Delivering the first batch of YONO earbuds to our users, enabling them to make charting much easier, was the happiest moment of our startup experience. ## Features - YONO wearable basal thermometer - You know your body with YONO - Get basal temperature to understand your fertility cycle - Don't pair the earbud with your phone before wearing it. Wear YONO in your ear for about 10-15 minutes, put the earbud back on the base station and connect with your phone. ## Images ![YONO Fertility Monitor, Sea Foam - Image 1](https://m.media-amazon.com/images/I/41wiFBCtthL.jpg) ![YONO Fertility Monitor, Sea Foam - Image 2](https://m.media-amazon.com/images/I/516VCugnqOL.jpg) ![YONO Fertility Monitor, Sea Foam - Image 3](https://m.media-amazon.com/images/I/4197uaOtxyL.jpg) ![YONO Fertility Monitor, Sea Foam - Image 4](https://m.media-amazon.com/images/I/61ScgQ6U21L.jpg) ![YONO Fertility Monitor, Sea Foam - Image 5](https://m.media-amazon.com/images/I/51R9EEfN0oL.jpg) ## Customer Reviews ### ⭐⭐ Good idea, poor execution. *by G***A on Reviewed in the United States on April 12, 2017* The concept of this product is wonderful, and honestly, it works as described as far as the monitoring goes. For me, I found it extremely uncomfortable to wear. Also, I ordered this new and received a used one. The second, replacement product I received was also opened, but didn't appear to be used. ### ⭐⭐ The only easy part was the *by R***R on Reviewed in the United States on October 30, 2017* Hurt my ears even with smaller tips so I either couldn't sleep or woke with sore ears. Gave me really unusual readings that seemed inaccurate, such as doling below 95 some nights. Also some nights would sync and give me a few hours worth of data, others would say I had several more hours of data than I should have. Could have been from the foot issue, not sure. The only easy part was the return ### ⭐⭐ Doesn't work for everybody *by D***D on Reviewed in the United States on March 17, 2017* I really really wanted this to work for me. My toddler still wakes at night and regular temp taking was not feasible. After half a month I am returning it. Yono has not picked up a temp shift when I ovulated, and many of my temperatures are so low that I'm positive they are wrong (I realize they will be lower than with a regular thermometer, but 93 degrees? I'm not dead!). I am sure this works for a lot of people, I just wish I was one of them. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/34871126-yono-fertility-monitor-sea-foam](https://www.desertcart.jp/products/34871126-yono-fertility-monitor-sea-foam) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-07*