Artificial intelligent assistant

What is this device on all the Tour de France riders' bikes? What is the device behind the saddle on all the riders' bikes in the 2015 tour? I'm seeing it on almost every bike. It looks standardized and electronic. !enter image description here

This is a special device that gathers the following data, according to this article:

> * the stage winner’s top speed, average speed and time per kilometer
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> * the fastest riders up key climbs
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> * the speed of the winner at the finish line
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> * the top speed achieved by a rider on the day
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> * average speed across all riders
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