Using a 3.5mm jack to plug into a PC’s mic port, this could be a very inexpensive way to track HMD’s.
The device was intended to measure latency.
Moreover, can you see the potential mobileVR use in actual game/experience use ?
Shown at GDC 2016 with no details yet of release date or pricing. But it is part of a bench-marking kit they are working on.