hardware has been upgraded with a new firmware, version 1801.
For most users, this will be no problem, as many have already received the upgraded edition.

To tell whether your hardware is compatible, look for the 1801 version in the bluetooth advertisement when connecting to the device.

For other versions, contact for advice. In some cases, an over-the-air update may be possible; for others, an equipment exchange may be required, free of charge.

For more information about the Ios app version 1.1.9, see the reply in the following post:
The app is live in the App Store!