Hi @randr, so within the EyeX SDK there is not the means to directly query the eye tracker model unfortunately, however as you pointed out across models some features are present whilst other are not (such as head tracking, presence, etc). Your best bet may be to cycle through these at startup and based upon error feedback, direct the program accordingly. Not a very elegant solution, but something to try out.. I will attempt to find a better one for you in the meantime.