It allows the computer screen and audio to be played on a TV screen or projector without any wires or cables.
When trialled in a home environment or an empty school environment, it works very well.
However, when it was rolled out to every Year 7 to 12 classroom it was problematic. Having lots of student laptops present and having teachers connecting and disconnecting in a number of different rooms as they taught different lessons created problems. Teachers had difficulties connecting to the MiraCast device; at times they had difficulty even 'seeing' the device.
Disconnections would sometimes happen spontaneously, and sound would break up on occasion.
The implementation was done with two major brands of devices after tests eliminated some cheaper devices.
It looks like waiting for the next generation of devices or the next major firmware update is necessary. It is a fantastic technology that can really provide flexibility in the classroom...can't wait for it to mature a little. In combination with the Surface Pro 3, it is amazing.