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Workout mode is a feature that simultaneously measures real-time data and links with your smartphone’s GPS.

1. Check location (GPS) permissions: To record an accurate route and distance during workouts, check that b.ring’s location permission is set to “Always Allow” in your smartphone [Settings].

2. Sync immediately after ending the workout: After finishing, be sure to press the [End Workout] button in the app to clearly close the session—this is required for data to save properly. Right after ending, run a manual sync from the home screen to safely transfer the workout data to the app.

3. Don’t forget to end the session: If workout mode is left on for a long time, abnormal data may be recorded or previous records may become corrupted.

b.ring uses an optical sensor to analyze blood flow at the skin’s surface and estimate blood oxygen saturation.

1. General wellness product notice: This product is not a medical device—it’s intended for general health management and wellness reference. As such, comparing the data measured by the device with measurements from a medical device on equal terms, or interpreting it for medical diagnostic purposes, is difficult.

2. Block external light interference: If the ring is worn loosely and there are gaps between your skin and the sensor, external light sources (sunlight or indoor lighting) can enter the sensor, causing blood oxygen values to be abnormally high or unstable. Recheck the wearing direction and size so the ring fits without rotating on your finger.

Blood oxygen saturation measurement is very sensitive to small movements and how the ring is worn. If automatic recording is being missed, please check the following.

1. Correct direction and snug fit: The red LED sensor (or the b logo) on the inside of the ring must face the palm side (under your finger). If the ring is worn loosely on your finger with gaps, light loss will cause measurements to be automatically canceled. Wear it in a size that fits snugly on your finger.

2. Allow smartphone background permissions: The mobile OS’s battery-saving features can block automatic background data collection. In your smartphone’s [Settings] > [Apps] > [b.ring], change the battery setting to “Unrestricted” and make sure Bluetooth and location permissions are always allowed.

3. Check sensor operation: When you manually measure blood oxygen via “Measure Now” on the app’s home screen, check that the red LED on the inside of the ring lights up properly.

Please check the following.

1. Skin temperature may not exactly match a regular thermometer reading.
2. Keep the app and firmware up to date.
3. Turn the relevant measurement item OFF and then ON again.
4. Check whether other measurements also look abnormal.
5. Also check whether battery drain is unusually fast.

Understanding the characteristics of the temperature data b.ring measures will help you use the data correctly.

1. Skin temperature vs core body temperature (normal spec info): The value b.ring measures is not the “core body temperature” measured by a medical thermometer (under the tongue or armpit), but the “skin temperature” on the surface of your finger. Skin temperature varies constantly with outside temperature, sleep environment (temperature under your blanket), how tightly the ring fits, etc., so it’s normal for it to differ from a regular thermometer reading.

2. Use as trend data: This feature isn’t intended for absolute body temperature measurement—use it to monitor the trend of changes against your usual nighttime skin temperature baseline and detect changes in your condition.

3. Check the snug fit: If the ring is too loose, outside air temperature can affect the sensor and produce abnormally low or high readings, so wear it in a size that fits your finger.

b.ring measures your heart rate by detecting blood flow in finger capillaries using an optical sensor (PPG). The following environmental factors can cause temporary errors.

1. Check for sensor debris: Sweat, cosmetics, dust, or other debris on the inner sensor surface can distort the light and produce inaccurate values. Wipe the sensor area thoroughly with a soft dry cloth or a wet wipe and let it dry completely before wearing.

2. Loose fit: If the ring is too loose, external light (sunlight, indoor lighting, etc.) can enter the sensor and interfere with measurements. Wear it in a size that fits snugly on your finger for better accuracy.

3. Temporary signal errors: Strong gripping or stretching of the hand, or activities that compress the finger heavily, can temporarily affect blood flow and cause errors. Compare again while you’re resting comfortably.

If there’s no heart rate data for a specific period or an entire day, please try the following steps.

1. Reset the Auto Measurement Mode timer: There may be a temporary sync mismatch between the ring’s internal measurement timer and the app settings. In the app, go to [My Page] > [Auto Measurement Mode], temporarily change the measurement interval to a different mode, reset the device (disconnect and reconnect), then restore the desired mode.

2. Check the sensor lights: When an auto-measurement cycle begins, check that the green LED inside the ring lights up properly.

3. Adjust the wearing position: If the sensor is positioned over a knuckle or another bony part of the finger with little flesh, blood flow measurement can be difficult. Move the ring slightly so the sensor sits on the soft inner part of your finger.

If the “Measure Now” function fails when you want to take a measurement at a specific moment, please check the following.

1. Minimize movement during measurement (most important): The PPG sensor in the smart ring measures subtle blood flow, so any finger or body movement during measurement distorts the signal and cancels the reading. Rest your hand comfortably on a flat table and stay still and quiet until the measurement completes.

2. Check sensor operation (LED): When measurement starts, check that the designated light inside the ring flashes properly (heart rate: green LED; blood oxygen: red LED). If the light doesn’t come on, you’ll need to check your Bluetooth connection or battery level.

3. Wear it snugly: When the sensor is in light, close contact with the inside of your finger, light loss is minimized and measurement is more accurate.

If sleep data is missing, check whether the conditions required for the device to detect sleep (heart rate and motion measurement) are being met.

1. Check sensor direction and snug fit: Make sure the ring’s internal sensor (or the b logo) is facing the palm side (under your finger). If the ring rotates during sleep so the sensor faces the back of your finger, or if it’s too loose, it won’t be able to detect the blood flow signals needed for sleep determination and won’t record data.

2. Check whether other data is being recorded: If other biometric data such as heart rate or blood oxygen also aren’t showing, check that [Auto Measurement Mode] is properly enabled under [My Page] in the app.

3. Restore data and sync manually: Due to platform (Google/Apple) policies, background sync is restricted while the app is closed. In the morning, open the b.ring app and pull down on the home screen to complete a manual sync all the way through, or run [Restore Data] in the app menu.

b.ring measures sleep stages by analyzing heart rate variability (HRV) and subtle movements together. For more accurate sleep measurement, please check the following.

1. Correct wearing direction and snug fit (most important): Wear the ring so the internal sensor (or the b logo) faces the palm side (under your finger). The PPG sensor needs to be in close contact with the blood vessels on the inside of your finger for accurate sleep analysis. If the ring rotates on your finger, records may be missed.

2. Pre-sleep behavior: If you lie on the bed and use your phone for a long time before sleeping, or rest quietly, the device may interpret it as “sleep onset” and record a longer sleep time.

3. Movement during sleep: If you toss and turn a lot, or your heart rate changes rapidly (e.g., during dreams), the device may interpret it as “awake” and record a shorter time than actual sleep. As continued wear builds up data, accuracy improves.

Sensor calibration is an auxiliary function for improving measurement accuracy and is applied differently depending on the model and firmware version.

1. Check supported models: Sensor calibration is a menu that’s only enabled on certain models with specific sensors. Please verify the detailed specifications of the b.ring model you’re using.

2. Allow time for data to accumulate: You may not see a big change immediately after running sensor calibration. To let the calibrated sensor learn your new movement patterns, wear the ring continuously for at least a day after calibration and observe the data.

3. Keep everything up to date: Occasionally, an outdated app version may cause menus to be missing or errors to occur, so please keep both the app and the ring’s firmware up to date.

If some time periods of data appear to be missing, please check the following.

1. Background sync policy: For battery efficiency and security, b.ring doesn’t send data in real time while the app is closed. If you’ve gone a while without opening the app, it may take time to retrieve all the missed data—please keep the app open and wait a moment.

2. Smartphone time settings: In your smartphone settings, check that [Date & Time] is set to “Automatic (use network-provided time).” If the time is set manually, data timestamps can become inconsistent and not display properly.

3. Time worn and charging status: While the ring is off your finger or sitting on the charging dock, biometric data and activity are not measured.

The smartphone and smart ring detect motion differently because of where they’re worn and how they sense movement, so differences in data are normal.

1. Difference in measurement method: A smartphone typically detects “pelvic movement” while in your pocket or bag, while the smart ring measures steps based on “hand swing and motion.”

2. Effect of everyday activities: When you do activities that involve a lot of hand movement (driving, brushing teeth, typing, gardening, etc.), your step count may temporarily appear higher than expected.

3. How to compare accurately: When comparing data, use the “total daily activity” as the reference. Also, wear the ring in a size that fits snugly so it doesn’t rotate on your finger.

If your b.ring step data isn’t showing up, please check the following in order.

1. Check the correct wearing direction: Make sure the sensor inside the smart ring faces the palm side (under your finger). The ring should fit snugly on your finger—not too loose—for accurate measurement.

2. Run a manual sync in the app: Due to mobile OS (Google/Apple) policies, real-time syncing is limited when the app isn’t open. Launch the b.ring app and pull down on the home screen to complete a manual sync.

3. Compare home screen vs detail screen: The number on the home screen updates relatively quickly, but the activity detail screen may take a little longer as data is aggregated.

4. Test with a few steps: Wear the ring and walk 20–30 steps or more, then reopen the app to see whether the number changes.