When one touches the chest-panel buttons, the figure utters either "friend" or "foe" statements (though coming from Vader, is there really any distiction?), which include: "Join me and together we can rule the galaxy"; "You are beaten. It is useless to resist"; "Impressive, most impressive"; and "Your skills are complete". The figure also emits lightsaber and blaster sound effects. (A motion sensor can automatically generate the vocalizations/sounds, if one desires.)
From what I've read, these suckers are selling as fast as they hit the shelves and are now going for "scalper" prices on a number of Internet sources. So glad fate favored me to find one, sparing me what may have been an arduous (and ultra expensive) quest.
Also, from a sojourn soon thereafter at my local Kmart, I came across a 12" Hasbro Kylo Ren. This dark, mysterious entity is destined to make a profound impression in "Force Awakens", and I'm pleased to have obtained this homage so far ahead of "Episode VII'"s release!!!