It's a TC-Helicon VoiceLive Touch. It's a vocal processor, harmony generator, and looping device that a guitarist can attach to his mic stand and use when performing live. We had fun playing around with the presets and giving folks a turn at the mic.
Unfortunately, the only way I could get it into the house sound with the cords I had available was to take a line out into the hotel system's mic in, so the signal was really too hot and tended to overload the PA.
But it's a really cute toy. And I've found the preset that sounds like CSN. :)