The same keyboard and pedals are used as in the grand pianos, in order to give the same feeling.
The sounds are generated in a sophisticated speaker system reproducing the samples taken from the analog ones.
More details in the following video http://www.youtube.com/watch?v=gmRjymP64OM
What I'm not sure is whether it comes with headphones output in order to play at home
Source: http://www.popsci.com/gear-amp-gadgets/ ... rand-piano