Hi @jzoest, thank for getting in touch. The Tobii 4C is part of the Tobii Tech business department which is focused exclusively focused on gaming and interaction and as such we will not support the use of this range of eye trackers in a mobile (non-screen) setup.
Additionally, the use of the 4C for anything other than gaming or interaction purposes requires the purchase of a special licence to do so.
Accordingly, should you wish to perform eye tracking on real-world stimulus, I would refer you to Tobii Pro who specialise in this sector @ https://www.tobiipro.com/product-listing/
Best Wishes