The only device capable of tracking both head and eye movements for a more immersive gaming experience, content creation and simulation gaming.
Not a bad device, but Tobii is a ridiculous company. They make some of the best eye trackers, even better ones for research, but completely lock down the software/firmare for their cheaper gaming eye trackers. These are the only ones that I can plausibly afford, I have attempted to use camera arrays in addition with webcam experiments but the models are not quite there yet.
Enough for getting metrics like Saccadic Peak Eye Velocity but beyond that very locked down. It is capable of pupil dilation metrics but doesnt let you.