There could be several reasons for this, check the following:

• Check the batteries have been installed correctly and the positive ends are pointing in the correct direction.
• Remove and reinstall the batteries (see, “How do I install/remove batteries?”).
• Check that your smart phone or tablet has its Bluetooth turned on.
• Force quit the app and relaunch it.
• If your smart phone or tablet's Bluetooth is turned on, turn it off and back on.
• If you use any other devices with the scale, turn their Bluetooth off (you can turn it back on once the scale has connected to your chosen device).
• Try restarting your smart phone or tablet.
• Try new batteries.

If the problem persists, please contact Customer Support [LINK] for assistance.