I tested all 3, they all play music, light up and Dogs move both ears and head and Penguin moves side to side and wings flap. I-cy takes 3 AAA batteries in his back and the I-dogs take 2 AA batteries inside a back foot. No batteries included. A regular RCA 3.5mm cable from a mp3 player or headphone jack will make them play, no cable included though.
They seem to have many functions but I have no manuals, the dogs get mad and growl when you shut them down, pretty funny. I can't guarantee they do everything they did when new, just what I've seen.
Dogs are both model C-015C Hasbro and Sega toys 2005.
Penguin is C-1063 2006 Hasbro