Sanokuni
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Sanokuni FAQ - Frequently Asked Questions

ハードウェア

Can I transfer the sauna device to someone else?
Yes. Please unpair the Bluetooth connection with your smartphone before transferring it. It can be used by connecting to the recipient's smartphone. The warranty period is registered from the date of first use, so it cannot be changed.
Is it possible to purchase the "sauna device" Otona no Kagaku model individually?
There are no plans for individual sales. Please purchase the new model, SHOWDOWN 1.
It says it is compatible with saunas, but up to what temperature is it supported?
The actual temperature varies depending on the installation position of the thermometer, your seating position, etc.\nPlease check the "Usage Conditions (Guidelines)" for actual operating conditions.\n\n* This product is designed to be worn and used in a sauna environment. Use in other high-temperature environments is not intended.\n* If you take off this product and leave it in the sauna, the internal temperature may rise, so please do not remove it and leave it behind or forget it.\n* We cannot answer individual questions about non-warranty situations, such as "Is it okay for up to 10 minutes at 110°C?".\n\nSAWATCH-3: Usage Conditions (Guidelines):\n- Use it on your wrist in the sauna room in an environment where the room temperature display is 100°C or lower. Also, aim for up to 20 minutes per session.\n\nSHOWDOWN 1: Usage Conditions (Guidelines):\nGuaranteed to be used for 3 hours at a seat temperature of 80°C (equivalent to a typical sauna temperature display of 95°C). Use in temperatures higher than this is not covered by the warranty.\n\nsauna device - Gakken Model: Usage Conditions (Guidelines):\nGuaranteed to be used for 3 hours at a seat temperature of 80°C (equivalent to a typical sauna temperature display of 95°C). Use in temperatures higher than this is not covered by the warranty.
Where can I check the warranty period?
You can check it from the [Sauna Device Info] screen in the app. The warranty period begins on the day you first connect the device to the app after purchase.\n\nSAWATCH-3: Warranty period of 12 months.\n\nSHOWDOWN 1: Warranty period of 6 months.\n\nsauna device - Gakken Model: Warranty period of 1 year.
Is privacy taken into consideration when bringing the device into the sauna or Bath Area?
The device is designed by eliminating everything except the elements necessary for the sauna experience. We declare in our Sauna Safety Policy (https://info.sanokuni.com/sauna-safety/) that the product excludes features like cameras and audio recording to ensure it does not violate the privacy of others.
Can the battery be replaced?
From the perspective of waterproof performance, battery replacement is not offered for any model.
Is it okay to charge the device immediately after a sauna?
Charging while the device is wet is dangerous and must be avoided. Please charge the device only after it is completely dry.
Can it be used as a smartwatch to display notifications from other apps?
Since it is designed as a dedicated sauna device, none of the models can receive notifications from other apps.
Can it be used underwater?
Please avoid using it for professional diving (such as scuba diving).\n\nSAWATCH-3: Waterproof rating IP68, 5ATM.\n\nSHOWDOWN 1: Waterproof rating IP68.\n\nsauna device - Gakken Model: Waterproof rating IP68.
Please tell me about the behavior of "Delete Measurement Data".
SAWATCH-3: Deletion operations are divided into two types.\n • Delete Heart Rate Data (within the Sanokuni App): Deletes heart rate-related data.\n • Initialization (under "Settings" > "System" on the watch): Clears all data inside the watch.\n\nSHOWDOWN 1: In addition to heart rate data, it holds sleep and step count data. Deleting data via "More" → "Delete Measurement Data" on the watch resets the step count data along with the heart rate data.
What wrist sizes does the included band support?
SAWATCH-3: Supports wrist circumferences of 16.6 cm to 23.2 cm.\n\nSHOWDOWN 1: Supports wrist circumferences of minimum 14 cm to maximum 21 cm.\n\nsauna device - Gakken Model: Supports wrist circumferences of minimum 14 cm to maximum 20 cm.
What material is the band clasp made of? Is it plastic?
The clasp is made of stainless steel.
Is it okay to use it for a short time in a sauna with a seat temperature that is not covered by the warranty?
It is not covered by the warranty, so any use is at your own risk. If the main unit gets hot or starts to swell, stop using it immediately, and stop using it immediately if you sense any other abnormalities.
How do I charge the device?
SAWATCH-3: Connect the included dedicated magnetic cradle (USB-A) to the charging terminal on the back magnetically to charge. It is also compatible with the SHOWDOWN 1 charging cradle. The estimated charging time is about 2 hours.\n\nSHOWDOWN 1: Place the dedicated charging cradle in contact with the terminal on the back of the watch.\n\nsauna device - Gakken Model: Pull off the band and insert the main unit, aligning it with the direction of the USB terminal.
How do I update the firmware?
SAWATCH-3: If there is new firmware for the sauna device, it will be displayed when you open the Sanokuni App.\nPlease update by following the app guide. You can also refer to the user guide: https://sanokuni.com/sawatch3/user-guide/

データ・計測

Can I split a single sauna session's data into separate records?
Data saved as a Totonoi Log cannot be split.
My wrist is thin, making it difficult to keep the sensor in close contact with my skin. Is there any solution?
Try wearing it slightly higher up on your arm to avoid any gaps.
Sometimes the body surface temperature or heart rate readings are abnormally low. Is this a malfunction?
The measured values may appear low when using the device for the first time or after a reset. Normal values will be displayed as you continue to use it.
When creating a Totonoi Log, the facility I want to register is not registered and cannot be selected.
Please temporarily create a Private Spot to register. You can register a Facility via [Settings > Report New Facility] in the app. Once the facility is registered, please change it from a Private Spot to the Facility.
How much battery charge is sufficient to take a sauna session?
SAWATCH-3: If you are starting to use it, a remaining battery of 40% or more allows for 4 hours of recording.\n\nSHOWDOWN 1: 80% or more is recommended. It is designed to record for 4 hours on a 100% charge.\n\nsauna device - Gakken Model: 80% or more is recommended. It is designed to record for 4 hours on a 100% charge.
How many hours of sauna records can be stored?
SAWATCH-3: In Sauna Mode, it can measure up to 8 hours at a time. Sauna Mode automatically ends after 8 hours.\n\nSHOWDOWN 1: Since it also retains data such as sleep and steps, the limit for a single recording is just under 3 hours. If it becomes full in around 2 hours, please try executing "Delete Measurement Data" on the main unit.\n\nsauna device - Gakken Model: Just under 4 hours of data can be recorded.
What happens if I go to the sauna twice on the same day?
If you retrieve data in two separate sessions, such as morning and night, two Totonoi Logs will be created.\nIf there is a gap of 30 minutes or more after Sauna Mode ends, two Totonoi Logs will be automatically created.
I forgot to switch between the sauna Scene and the cold bath Scene. What should I do?
You can edit this in the app. Please start from the timing when you can turn the Scene on.
What happens if I accumulate more data than the memory limit?
The time count during Sauna Mode will continue, but data after the memory is full will not be recorded.
When exiting Sauna Mode midway, sometimes a "Do you want to combine?" screen appears, and other times they are combined automatically.
The behavior changes depending on the interval.\n • Less than 1 minute: Automatically combined as the same Totonoi Log\n • 1 minute to 30 minutes: Displays the "Do you want to combine?" dialog\n • More than 30 minutes: Counted as a separate Totonoi Log
What are the rules for heart rate notifications during Sauna Mode?
SAWATCH-3: You can create 8 notification Sets across the sauna, cold bath, and rest Scenes. You can configure them by combining two conditions.\n • "Heart rate 130 bpm + 5 minutes elapsed" → Notifies only once when both conditions are met simultaneously.\n • "Heart rate 130 bpm" only → Notifies at 130 bpm regardless of time.\n • "5 minutes elapsed" only → Notifies after 5 minutes regardless of heart rate.\n\nSHOWDOWN 1: Once notified, no further notification will be sent for 5 minutes. After 5 minutes, a notification will be sent the next time the set value is reached.
The screen's tap response is sluggish when wet. Is there any workaround?
Please wipe the device and your finger with a dry towel or sauna hat. Although it is a feature exclusive to the Premium Plan, you can also try auto-labeling (https://info.sanokuni.com/7ab7686f72f04ac7aab36e7f4182fd09).
Is it better to wear the watch on the inside or outside of the wrist?
Either is fine. Please wear it on the side that makes it easier to keep in close contact with your skin.
Sauna Mode ended due to an accidental operation. What should I do?
Please enter Sauna Mode again. If you enter Sauna Mode again within 30 minutes after the mode ends, the data will be integrated as a single record.
I want to record at a private sauna or a tent sauna.
You can create a Private Spot. Create it with a name, select it, and register.

トラブル

The heart rate is being measured abnormally high.
In rare cases, a phenomenon has been observed where the heart rate continues to rise after a cold bath or during rest. This happens when the sensor fails to capture the heart rate properly. It can be resolved by removing the band once and wearing it again. The measurement is reset when the heart rate reading starts from "- -".
I cannot send Totonoi Log data.
"Facility/Location" registration is a required field. Please register a Facility and send the data. If you still cannot send it, please check your network signal. It may be difficult to receive a signal inside the facilities.
The sauna device stopped responding after a sauna session.
If the temperature of the main unit rises too high, it may not start up. In that case, please try recharging it after letting it discharge.
I can no longer connect to the Sanokuni App.
Delete the Bluetooth registration once from your smartphone's settings. Please try pairing again and connecting to the app.
My totonoi data is not displayed. It shows (- -).
Please check the following:\n • Calculation is basically premised on the routine of "sauna → cold bath → rest". It may not be calculated correctly outside of this routine.\n • Please check if the heart rate data in the Totonoi Log is labeled as a Set of "sauna", "cold bath", and "rest". It cannot be calculated with only "sauna".\n • Data creation may fail if sent under poor network conditions. Please make sure you are online.
Water droplets have appeared inside the screen. Can I no longer use it?
The inside of the screen may fog up depending on usage conditions. Please temporarily stop using it and let the main unit dry completely. If the fogging disappears within a few days, there is no problem. If the fogging does not disappear or water has penetrated inside, do not use it and immediate replacement is required.
I cannot connect to the Sanokuni App.
Please check the following:\n • Ensure your smartphone is a compatible model and has a compatible OS.\n • Ensure your smartphone's Bluetooth is turned on.\n • Ensure Bluetooth connection is established with the smartphone (if not, try resetting the watch and attempt the Bluetooth connection again).\n • If it remains paired with another smartphone, it cannot connect to a new smartphone. Please disconnect the Bluetooth connection on the original smartphone.
Even after data synchronization, there are no records/no data.
The following cases are possible:\n 1. When "No data" appears after showing synchronization: This occurs when data is collected but no heart rate data exists. It can happen if Sauna Mode continues for a long time with the watch removed from your wrist (such as accidental activation inside a bag). It can be resolved by synchronizing once before entering the sauna.\n 2. When "No data" appears without synchronization starting: This can occur in cases where a Totonoi Log is started without being connected to the app (disconnection during the sauna session is not an issue).\n 3. When irrelevant heart rate data or empty Totonoi Logs are registered: The capacity may be full with accidental operation data. It can be resolved by synchronizing once before entering the sauna.
The numbers displayed on the sauna device are strange.
If the time value during Sauna Mode is incorrect or the step count overflows, please try resetting it once. Since data will be deleted at that time, please synchronize with the app first if any sauna data remains.
The device does not appear on the connection screen of the Sanokuni App.
Please try "Initialize Unit" on the watch once.
The app stopped launching.
Please try deleting the app and reinstalling it.
The app crashes.
If the app crashes in the same way under specific situations, please report it as a bug. We will investigate and repair it. Please let us know the details through the Inquiry section in the app.
My heart rate is recorded as high even during rest / The ups and downs of the heart rate do not seem to relate to each sauna Scene.
1. If external light enters the internal sensor, the accurate heart rate cannot be measured. Make sure the back of the band and your arm are in close contact.\n 2. If the readings continue to rise before and after moving between Scenes, please remove the band once, wipe the sensor lightly, and put it back on.\n—\nIf the above persists, please try resetting the device. If the symptoms occur frequently or do not improve even after trying everything, there may be a malfunction. If it is within the warranty period, please contact the Inquiry contact listed in the user manual (the warranty period can be checked from the app).
The charging terminal broke. Is repair possible?
From the perspective of waterproof performance, we do not offer repairs for the main unit.
Firmware update fails.
SAWATCH-3: If the firmware update fails midway, please bring your smartphone and watch closer together and try a few times.\nhttps://sanokuni.com/sawatch3/user-guide/\n\nIf it fails after several attempts, please contact us via the Inquiry form in the Sanokuni App.

アプリ・アカウント・サブスク

How many days of data can be saved with the Basic Plan?
The retention period for heart rate data in the Totonoi Log is 30 days. Detailed data will be deleted after 30 days.
Does the Sanokuni App support changing phone models?
Yes, it is supported. Please log in with the Apple ID or Google account linked to your account before the change. However, changing from iOS to Android is only possible if you created your sign-in with a Google account.
Can I transfer account data to another account?
Transferring or merging data between accounts is not supported.
Is it possible to measure data simultaneously with SHOWDOWN 1 and the Otona no Kagaku model?
Yes, it is possible. Since you cannot connect to the app simultaneously, please disconnect the one that retrieved data first from the Sanokuni App, then connect the next watch to synchronize the data.
Will there be support for Android OS 11 or earlier versions?
There are currently no plans to do so. We plan to prioritize the development of new features and overall system stability.
What kind of features are restricted in the Android version's functional limitations?
The details are explained on the dedicated page (https://info.sanokuni.com/for-android-user/).
Please tell me the compatible models and OS for the Sanokuni App.
It is iOS 16 or higher / Android 13 or higher.\nStarting from the update at the end of 2026, we plan to switch support to up to the current -2 versions. Please be careful if you are purchasing a new device.
What kind of features will be added in the future?
We will release the development roadmap soon.
Data older than 30 days has disappeared. Can it not be restored even if I upgrade to the Premium Plan?
Once data is deleted, it cannot be restored at this time.
I want to introduce it for users to use at sauna facilities, is that possible?
Yes. It is also possible to have them sold in-store, etc. Please contact us via email (support-store@100plus.co.jp).
Are there plans to support devices other than the sauna device?
Currently, there are no plans to support Apple Watch or other smartwatches. This is because they do not meet the requirements for use inside sauna rooms, so we cannot recommend using them. If smartwatches that meet the requirements are released in the future, we will consider supporting them.
I want to cancel the Premium Plan.
Please complete the procedure through your App Store or Google Play account. Cancellation procedures cannot be performed from within the app.
Can I switch to a different Sanokuni account while subscribed to the Premium Plan?
Even if you create a new account or change to a Basic Plan account while the subscription is ongoing, that account will remain in the Basic Plan state. If you want to apply the Premium Plan to the new account, you can transfer the plan from the original account by selecting "Restore" from My Page > Plan. At that time, the original account will be changed to the Basic Plan, and Totonoi Log data older than 30 days will be deleted.

危険・保証

Please tell me about the hardware warranty details.
For the warranty of the sauna device, please check "Product Warranty (https://info.sanokuni.com/product-warranty/)".
About hazardous/discontinued actions
• Do not remove the sauna device in the sauna room.\n • Actions such as disassembly, dismantling, or modification are prohibited.\n • If used near a heat source such as a stove in the sauna room, it may temporarily exceed the supported temperature due to the effect of radiant heat. Please do not get too close to the heat source.\n • If the main unit gets hot or starts to swell, stop using it immediately, and stop using it immediately if you sense any other abnormalities.
FAQ and Troubleshooting for sauna devices and the Sanokuni App | Sanokuni