A simple rotating display. Just spin and enjoy. While the `Air display` is rotating, it writes the message on the air. Because the `persistence of the vision`, you will be able to read the message. The operation is super simple and you don't need an user manual. Press the button to turn it on. Press the button to change the message and press the button to turn it off.
NOTE: Use high brighness leds to use it in daylight. UPDATE: May 27, 2004 I found a web page selling a similar product: http://www.theskyliner.com - you can visit the webpage to see how this work. My Air display have 15 messages. The sky liner have only 10.