Frequent Questions
Can anyone purchase and use CART BP without a prescription from a healthcare professional?
Yes. CART BP can be purchased and used without a physician’s prescription.
Which finger should the CART Ring be worn on?
Wear the CART Ring on the non-dominant hand, excluding the thumb.
Please note that wearing it on a different finger from the one used during blood pressure calibration may affect measurement values.
If you change the wearing position, blood pressure calibration must be performed again before use.
Can I wash my hands, shower, or swim while wearing the CART Ring?
CART BP has an IP58 rating and can be used during everyday hand washing or brief exposure to water.
However, prolonged submersion in water should be avoided.
About the IP58 rating
The product is protected against dust and is designed to withstand temporary immersion in water under specified conditions.
How do I change my password?
You can change your password by following the steps below:
1. Tap the person icon (My Info) in the upper-right corner of the app home screen.
2. Select your account (ID) at the top of the My Info screen.
3. Tap [Change Password] at the bottom of the Manage My Info screen and set a new password.
A pop-up says, “There has been a suspicious login attempt from another device.”
This pop-up appears when there have been multiple login attempts (5 or more) from a device other than the one registered to your account.
To protect your personal information, we recommend resetting your password.
A pop-up asks me to allow permissions after installing the app.
Required permissions must be enabled to ensure proper use of the CART BP app.
[Android]
- Required permissions:
ㆍNearby devices
ㆍLocation
ㆍStorage
ㆍNotifications
- Optional permission:
ㆍCamera
[iOS]
- Required permission:
ㆍBluetooth
- Optional permissions:
ㆍCamera
ㆍPush notifications
* Required permissions may vary depending on the Android or iOS version.
A pop-up says, “You have been logged out because this account is logged in on another device.”
Simultaneous login is not supported.
This pop-up appears when the same account is logged in on two or more mobile phones at the same time.
If you need assistance, please contact us at info@skylabs.io.
I forgot my login ID or password.
If you do not remember your account or password, you can verify your account or set a new password using mobile phone verification.
Please follow the steps below:
1. On the app login screen, select [Find ID / Password].
2. Complete mobile phone verification.
3. Once verification is complete, you can check your registered login ID or set a new password.
※ The mobile phone number entered must match the number registered when the account was created.
※ If verification cannot be completed successfully or your phone number has changed, please contact us at info@skylabs.io.
I tried to register the product, but a pop-up says, “Unable to connect to the CART Ring.”
This pop-up appears when the CART Ring and smartphone are not connected properly.
Please check the following:
ㆍMake sure Bluetooth is enabled on your smartphone.
ㆍIf the CART Ring does not connect even when Bluetooth is enabled, place the CART Ring on the cradle, charge it sufficiently, and try connecting again.
If the issue persists, please contact us at info@skylabs.io.
How do I register the product?
You can register the product using either of the following methods:
ㆍScan QR Code: Scan the QR code included inside the product box.
ㆍEnter Serial Number: Manually enter the serial number printed on the outside of the product box.
During product registration, a pop-up says, “This CART Ring is registered to another user’s app.”
This pop-up appears when the CART Ring is already registered to another account.
If you know the previous account:
Complete the following steps before registering the CART Ring to the new account:
1. Tap the person icon (My Info) in the upper-right corner.
2. Select [CART Ring Management].
3. Tap the three-dot menu (···) to the right of the registered CART Ring.
4. Select [Delete CART Ring].
If you do not know the previous account:
Please contact us at info@skylabs.io.
It has been 2–3 hours since charging started, but the cradle LED has not turned green.
A full charge normally takes approximately 2–3 hours.
However, if the CART Ring has been deeply discharged, charging may take longer.
If the cradle LED still does not turn green, remove the CART Ring from the cradle, place it back on the cradle, and try charging again.
If the issue persists after recharging, please contact us at info@skylabs.io.
The cradle LED does not light up while charging.
If the cradle LED does not light up, charging may not be proceeding properly.
Please check the following:
ㆍMake sure the CART Ring sensor is properly aligned with the sensor indicator on the cradle.
ㆍTry using a different USB cable.
ㆍMake sure the power adapter is properly connected to both the wall outlet and the USB cable.
If the issue persists after checking all of the above, please contact us at info@skylabs.io.
The cradle LED changes from green → red → green while charging.
This is part of the normal charging process and does not indicate a defect.
If you notice any other unusual behavior or charging does not proceed properly, please contact us at info@skylabs.io.
The CART Ring becomes warm while charging.
A certain amount of heat may be generated while the CART Ring is charging.
However, if it becomes too hot to touch, please contact us at info@skylabs.io.
The cradle LED blinks red while charging.
If the cradle LED does not light up, charging may not be proceeding properly.
Please check the following:
ㆍMake sure the CART Ring sensor is properly aligned with the sensor indicator on the cradle.
ㆍTry using a different USB cable.
ㆍMake sure the power adapter is properly connected to both the wall outlet and the USB cable.
If the issue persists after checking all of the above, please contact us at info@skylabs.io.
How long does it take to fully charge the CART Ring?
A full charge generally takes about 2 hours.
Can I delete a registered CART Ring?
Yes. You can delete a registered CART Ring by following the steps below:
1. Tap the person icon (My Info) in the upper-right corner.
2. Select [CART Ring Management].
3. Tap the three-dot menu (···) to the right of the registered CART Ring.
4. Select [Delete CART Ring].
What does the “Re-register CART Ring” function under CART Ring Management do?
If a CART Ring that was previously registered to the account has been deleted from the CART Ring list, this function allows you to register it again quickly and easily without rescanning the QR code or re-entering the serial number.
Only CART Rings deleted within the past 3 months are automatically displayed in the re-registration list.
If more than 3 months have passed, the CART Ring will no longer appear in the list, and you will need to scan the QR code again or manually enter the serial number.
Why is blood pressure calibration required?
The CART Ring estimates blood pressure based on photoplethysmography (PPG) signals from the finger. To measure blood pressure accurately, a reference blood pressure value is required for each user.
The process of entering a reference value measured with a cuff-type blood pressure monitor is called blood pressure calibration. This allows the measurement algorithm to be tailored to the individual user.
For accurate continuous measurement, calibration is requested every 4 weeks (28 days).
Why should the cuff-type blood pressure monitor and CART Ring be worn on different arms during calibration?
A pop-up says, “The blood pressure value displayed on the cuff-type blood pressure monitor appears to be incorrect. Please wear the cuff-type blood pressure monitor and CART Ring correctly and measure again.”
Will blood pressure not be measured if I do not complete calibration?
When a CART Ring is registered in the app for the first time, the app will repeatedly prompt you to perform blood pressure calibration. Blood pressure measurement begins only after calibration has been completed.
Please follow the in-app instructions to complete blood pressure calibration first.
After use begins, calibration must be repeated every 28 days.
Once 28 days have passed, blood pressure values will not be displayed until calibration is completed again. Measurements will resume immediately after recalibration.
Blood pressure calibration is an essential process used to optimize the measurement algorithm for the individual user’s blood pressure pattern and physiological characteristics and to maintain measurement accuracy.
What is the blood pressure measurement range?
The measurable range is:
Systolic blood pressure: 70–180 mmHg
Diastolic blood pressure: 40–120 mmHg