X Mask is developed by Japanese startup called Dolami. It is capable of tracking facial expressions in detail thanks to a series of incorporated sensors placed strategically across the face. These sensors are internal, and they do not affect your facial skin.
The device can transmit your expressions to a VR avatar with over 95% accuracy. X Mask features a delay speed of 200 milliseconds and takes less than five seconds to pair with a VR headset. The device will cost $90 USD.
More information:
https://vrscout.com/news/this-futuristic-vr-facemask-tracks-your-expressions/