With your very own plasma light disk clipped to your pocket, belt clip, purse, hat or anywhere you need to add a little energy. Incredible Pocket Plasma uses super bright LED technology and a microchip to create a flat panel disk with an amazing display of plasma light that responds to your touch, voice or motion to your music. Has a normal "on" mode as well as a sound-responsive mode that makes the light "dance" with the music or your voice. Requires 2 AAA batteries, not included. Approximately 2.75" x 1.25". Don't go out at night without it!