The T-qualizer was so popular, that there has been a slew of spin-off accessories based on it. And now there is the Raving Smileys T-Shirt With Ultra Sound Sensor. This T-shirt is basically the T-qualizer, but with smileys. The smiley faces will jump and flash in time to music. The shirt comes with a lightweight battery pack that is hidden away in a secret pocket in the shirt, and the battery should last you all night long while partying. You can pick up the Raving Smileys T-Shirt for $29.99.