Thank you, then I will try with Tobii 4C.
But still, I had problems while I was trying to install the usbservice.deb file and the other requilred .deb file for linux. So, even though they are compatible with Tobii 4c, I don’t think it would work properly.
The problem that I had is that it installed but in few seconds, they were just disappeared. Is this supposed to be like this? So I cannot see them on installed add-ons in Linux? I can only see the config program which seems to be more stable.
If this is normal, I will just buy Tobii 4c then!