Shipping & Billing

How much is shipping?

We offer free shipping in the United States. If you live in another country, our flat international shipping fee is $20.


Why did I receive a shipping notification but there was no shipping record?

The USPS might not the scan the package at every stop. But once it arrives in your area, it will be scanned. I understand that this may be annoying, but it often happens.

Using YONO

Can YONO tell me how fertile I am?

Yes, YONO can predict your fertility level based on your daily BBT result. And if you input more parameters, YONO can predict so much more!


Does YONO detect irregular cycles?

At this moment, our algorithm is not able to detect irregular cycles. However, this function is on our update schedule.


How does YONO predict my fertile window?

Fertile window might vary. The highest level is peak – usually, the two days around ovulation.


Is YONO more accurate than other BBT thermometers?

YONO detects your core body temperature. Other monitors only detect your skin temperature, which may easily be affected by room temperature.


How is the BBT calculated by YONO? I noticed it isn't the lowest temp for the night. Is it an average?

YONO machine learning algorithms plot monthly fertility chart based on user's’ overnight temperature data, behavior pattern and sleeping cycles. Pattern recognition algorithms help users determine the temperature shifting date when the ovulation happens.


Does the device send data while I sleep?

No. YONO doesn’t send any data during sleep; YONO’s bluetooth mode only works when you return the earbud to its base station.


Does the YONO earbud come in different sizes?

YONO earbud comes in one size. However, we have three sizes of eartips. If you feel uncomfortable about the YONO earbud, feel free to contact us. We have a 30-day money-back guarantee.


How long do I need to wear YONO each night?

At least five hours. If you wear YONO less than five hours, it may not collect enough data to calculate your BBT.


Should I start wearing YONO on the first day of my cycle? Or is it okay to wear it in the middle of my cycle?

You could start wearing YONO as soon as you receive it, no matter where you are in your cycle. Don’t forget to put your day 1 data in the chart – it will help us to monitor your cycle.


How often do I have to wear the YONO earbud?

In order to get accurate results, we strongly suggest that you wear your YONO earbud every night, while you sleep.


What should I do if my skin feels itchy?

Using YONO may cause discomfort in the ear canal or to the skin; if this is the case, discontinue use and see a doctor if necessary. Please also feel free to contact us through customercare@yonolabs.com.


Can I use YONO to monitor fever?

No, the YONO earbud is not intended to monitor fever, or any other medical condition.


Should I wear YONO if I'm sick?

No, do not wear YONO when you're ill. With fever, especially, your temperature may change and influence results. Keep yourself comfortable and drink more water. Once you recover, you may continue to use YONO.


Will travel influence my predictions?

Jet lag can influence your body rhythm, causing your temperature to fluctuate and/or be different than usual.


I work the night shift. Can I still use YONO?

If your sleep schedule is regular and you are able to wear YONO for at least five hours each night, yes - YONO could still calculate your BBT data. However, if your schedule always fluctuates, your body temperature may vary.


Do any medications affect my results?

Yes, medications may affect results. Please document which medicine you are taking.


If the YONO earbud fell off while I was sleeping, are my results still accurate?

YONO needs a minimum of five hours of recording during your sleep phases, so it might influence your result.


Should I wear YONO after I've been drinking alcohol?

It depends on how much and how often you take. If you drink only a glass of wine with a meal, it is not a big problem. If you drink a glass of wine every day, that is also fine. But if you drink a lot in a single day, you may get a different BBT result.


Can I wear YONO while I'm not sleeping?

We strongly suggest you only wear YONO when you are sleeping. There may be too much interference data for the application to calculate your result.


Why is the YONO BBT temperature readings lower than the reading I have been getting from a traditional basal thermometer?

Just as body temperature readings taken from the armpit vary from readings taken from under the tongue, the body temperature collected by YONO in the ear canal may differ from readings taken from other parts of the body or from other devices. 


Why does my YONO nightly chart look different than my friend's?

Sleeping positions and patterns vary widely between users. Your nightly chart may look different from other YONO users.


Do I really need to enter day one of my period into the app?

Yes, that is very important.


What happens if I miss a night?

Prediction quality might decrease. For the most accurate results, please wear YONO every night.


Can YONO be used to prevent pregnancy?

We don't recommend you use BBT data alone to avoid pregnancy. By tracking BBT each day, you may be able to predict when you'll ovulate. If you're hoping to avoid pregnancy, you can use the BBT method to help determine which days to avoid unprotected sex. However, the BBT method alone doesn't provide enough warning to effectively prevent pregnancy. If you are hoping to avoid pregnancy, it is generally used in combination with other fertility awareness-based methods.


Does YONO predict ovulation postpartum…even without having ovulated?

Right now, we do not have any research to support if the BBT could be used postpartum and while breastfeeding.


Can I charge YONO with my phone cable?

Of course! You may charge YONO with any Micro-USB cable that fits.


How long does the battery last? How often should I charge the battery?

The battery should be charged daily. We suggest that you return YONO to its base station, after you synchronize, every morning, so it may charge during the day (make sure the base station is plugged in!). A fully charged YONO could last a whole night.


How do I clean the device?

The YONO earbud is not waterproof. You can’t wear YONO during a shower, or clean the device by immersing the earbud in water. For cleaning instructions, please check the following information.


There is no button on the device. How do I know if it is on?

YONO earbud will automatically turn on when it leaves the base station.


What should I do if the battery doesn’t last overnight?

Make sure your device is fully charged before wearing it. You should see the green light flash very quickly. It usually takes about 2 hours for a battery to be charged. If you're still having issues, feel free to contact us at customercare@yonolabs.com.


What should I do if the BBT doesn’t show on the screen?

First, please make sure you wear YONO earbud at least five hours every night. If you wear it less than five hours, no BBT data will show next day. If you wear YONO earbud the whole night and still do not get any BBT data, please contact us at customercare@yonolabs.com.


Is YONO waterproof?

The YONO earbud is not waterproof. You can’t wear the YONO during a shower or clean it by immersing the earbud in water.


What should I do if my YONO earbud won’t connect with the app?

When the earbud is fully charged, a green light will intermittently flash quickly.  After you wear it for a night, and place it back on the base station, a blue light will appear, indicating it is ready for data transmission. If you still have questions, please contact us at customercare@yonolabs.com.


If I forget to plug it in, does it store multiple temperatures?

If you forget to plug in the earbud, most likely it will run out of battery and won’t store multiple nights’ data.  We suggest that users to place the earbud back in the base after using it for a whole night.

Warranty, Return and Refunds

What is YONO's return/refund policy?

If you are not happy with your purchase for any reason, we will gladly accept your return within 30 days of the actual delivery date. To return your YONO, please contact our customer care team to initiate the return process and your refund will be processed within 7-10 business days of receipt at our warehouse. Your refund (minus shipping and handling fees, if any) will be issued in the form of your original payment method. Please allow up to 7 business days for the refund to appear on your actual credit card statement.


What is YONO's warranty policy?

YONO offers a one-year limited warranty. Should this product from YONO Health Inc. prove to be defective in material or workmanship, within one year of original purchase (the actual delivery date), it will be repaired or replaced. This warranty does not cover damage in shipment or failure caused by tampering, carelessness, or abuse. If you experience any issues with your device, feel free to contact our customer care team or go through our Contact Us page.