The first prototype covers the wearer's ears, mouth and nose and uses a directional microphone to give him the ability to hear an isolated sound in a noisy environment. For example, you could target a person in a crowd and clearly hear his words without the surrounding noise.
The other prototype is worn over one's eyes. A camera captures video and sends it to a computer, which can apply a set of effects to it in real-time and send it back to the wearer. One can, for example, use it to see movement patterns, similar to the effects of long-exposure photography.