One can also assume (as I did) that it's a microphone, seeing as they never gave CG-Snootles a mic stand like the old one had, and we see her and the three back-ups sing into the device. (Speaking of which, I love the laziness that had them leave the old Snootles in the first shot of the sequence. Just like the new Artoo rocks that disappear.) But I don't know what that device is for sure...regardless of justification, I just personally didn't dig such average CG creations leaning in to camera like that. But it's not as though it's the only reason I hated the new music number, it's just a part.