XP3 Ultra Message "Persistence of Vision" Clock

Create your own visually stunning custom message with the XP3 Ultra Clock. With its unique "persistence of vision" technology, your message appears to float in mid-air, "drawn" by a quiet, motor-driven LED wand that sweeps across 16 times a second. With multi-directional buttons for easy programming and automatic Daylight Savings Time.

Full Features:

• Red hi-luminosity LED with controllable brightness (dimmable)
• Program 4 custom messages using 200 characters each (total 800 characters can be stored)
• Fun and creative symbols, like ♥
• Built-in pre-programmed greetings ("Good Morning", "Happy Mother's Day", "April Fools", "Happy New Year", "Happy Valentine's Day", etc.)
• Multi-directional buttons make programming custom messages easy
• Quartz-accurate clock with 100 year calendar
• Quiet, motor-driven wand
• Sleek exterior body (black)
• Automatic D.S.T. (Daylight Savings Time)
• Real Time Clock maintains date and time during power disruptions
• AC Adaptor included

So, how does it work?

The XP3 clock's wand oscillates back and forth; in a plane that is typically nearly perpendicular to one's line of vision, approximately 16 times per second. Eight LEDs (light emitting diodes) are embedded along a line near the tip of the wand. Because the flashing LEDs remain on for only 0.185 milliseconds, only one point on the retina is stimulated so our brain interprets the information as a point of light. As the oscillating wand passes across one's field of vision, the eight LEDs are programmed to blink, such that a pattern is produced, which is interpreted by our brain as a character.

Some of the LEDs need to blink more than once in order to produce a character. For instance, the top LED on the wand blinks five times in order to produce the horizontal line of the top portion of the number "3". Since up to 12 characters can be displayed at one time, if the number '3' were repeated 12 times across the display with no spaces between the numbers, the top LED would flash on and off 60 times per sweep of the wand. Amazingly, since the wand makes 16 sweeps per second, the top LED in this example would be required to flash 960 times per second to create the perceived pattern. Due to the 'persistence of vision', the brain does not perceive that the points of light are being repainted 16 times per second.

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