i LED watches use Light Emitting Diodes for the display & light up brightly in various colors. The most common being red, green, yellow, blue & white. Wrist watches using LEDs became popular in the 70's, but are less common today.
Because the LEDs require more power than a regular digital watch it's normal for all LED watches to require you to press a button to show the time. If the LEDs were constantly lit, the battery would run down quickly.
LED watches are unusual, eye catching and cool. At Tokyoflash we take LED watches to a whole new level.

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