Blinx by Andrea Electronics are high-fidelity stereo ear bud earphones with LED lights that flash in unison to the output signal of any audio device that has a 3.5mm stereo jack (patent pending). Blinx by Andrea provides AudioOptic™ technology, creating a brilliant visual of the sonic activity, enabling you to "See the Sound"! LED's are located in the stems of the ear buds and on the front of the chest medallion circuitry/battery housing. The medallion is located at the middle of the Y-cable, so the user can view the LED sonic activity. The Blinx medallion has a slide switch for LED power on/off. The cell phone headset version (coming soon) also has a push button for answering MP3 cell phones. Product uses two small 7mm hearing aid batteries. When Ordering please state in the comments field what colour Blinx you require. We have white, pink, blue, red, green, and orange available.