What's on the back of tour seats

[Tv72av]

Is that a camera or radio on the back of the riders seats

 

[del1962]

Is that a camera or radio on the back of the riders seats

Telemetry telling position of rider

 

[Tv72av]

Thanks

 

[jmdirt]

Is that a camera or radio on the back of the riders seats

Picture 12:
http://velonews.competitor.com/2015/07/gallery/pro-bike-gallery-andrew-talanskys-cobble-ready-cannondale_376880

 

[BigMac]

What? It's not an HD action camera like Paulo Martins and Luís Piçarra have told me?

My life is a lie.