On touch screen devices with eyetracking such as e.g. the I-Series, you will hear a beeping sound through the speakers when pressing NUM Lock on a connected external keyboard while in Tobii Dynavox Gaze Interaction Settings, This is due to a Windows feature called Mouse Keys that Tobii Dynavox Gaze Interaction software enables.
That beeping sound is only a notification and not causing any problems. You can temporarily turn it off by the following changes in the Windows settings:
Go to Windows Control Panel
Ease of Access
Change how your keyboard works or Make the keyboard easier to use
Uncheck "Turn on Mouse Keys"
Click OK or Apply
Note that this will only solve the problem for this session, it will be reset once you've closed and start TGIS again.
