Red light = Pick up your noodle!
The Cathay Lounge at the Hong Kong Airport has a Noodle Bar that is always crowded, and for good reason. I finally decided to try it out today. The lady took my order, handed me a green thingy and said, “Come back when is red”. Call me stupid, but I had never seen anything like this before. I walked away from the bar with excitement; sat down at a nearby table and started looking at in awe. It read in English and Chinese: Your favorite noodle is ready for you to collect if the light is on or vibrates. I didn’t take my eyes off it so as not to miss the spectacle. Sure enough, in a couple of minutes the red lights around the edge of the circle start blinking – quietly announcing that my noodle is ready. WOW, what an innovative product/idea!
I wonder why this thingy hasn’t become more popular in clinics, hospitals, banks or wherever you take a number and wait for the number to be called. And the number is only called when you take a toilet break 
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It actually has, kinda, taken off States side. Mostly restaurants, but other sort of businesses too. Most look like pagers.
we sure look forward to this in our part of the world.