Amazon's description:

From the Manufacturer
BEATMIX BUMBLEBEE is the TRANSFORMER for your tunes! Its built-in music speaker “speaks” music and its beat builder dances to each new rhythm! In a twist of customized cool, BEATMIX BUMBLEBEE takes your tunes and samples them back to you with effects and sounds from the new TRANSFORMERS movie! Touch BEATMIX BUMBLEBEE to mix new music, or pose its arms and sit back to watch it dance to different sound effects: it’s MORE THAN MEETS THE EAR! BEATMIX BUMBLEBEE works with most music devices. Plus it easily connects to any standard headphone jack on a variety of audio devices with the included plug cable.

Product Description
Beatmix Bumblebee is a speaker for your MP3 player (not included) or music player. So much more than just an action figure, Beatmix "speaks" music and has a beat builder that allows it to dance to each new rhythm. In a twist of customized cool, Beatmix Bumblebee takes your tunes and samples them back to you with effects and sounds from the new Transformers movie. Touch Beatmix Bumblebee to mix new music, or pose its arms and sit back to watch it dance to different sound effects. It's more than meets the ear!
Beatmix Bumblebee works with most music devices (not included). Plus it easily connects to any standard headphone jack on a variety of audio devices with the included plug cable. Requires 4 "AAA" batteries, not included.