In the B.One App:
Tap on Devices.
Tap on Edit at the top-right corner and tap on ‘-‘ icon from the list of devices. You will be prompted to delete the device, select Delete.
Turn the sensor upside down; Click the white button once on the rear of the sensor. A pop-up appears on the screen stating that the device has been successfully deleted.
Note: If the device fails to delete, a Deletion timed out prompt will appear on the screen to force delete the device.