Flashing light on Rossi's suit

There's a flashing light on Valentino Rossi's suit (see the red circles on the pictures below). It's something I had never observed until tonight during the post-race interviews. Does it have something to do with the Dainese D-Air system of his suit ?

If anyone knows, drop a me line.

New kit

My old trusty Dainese boots are about to retire ... at last. These have beenfaithfully with me for almost 10 years whatever the bike, wherever we rode : from simple roadsters to advanced soprtbikes, from winter frozen road in the North to hot summer melted track tarmac in the South. They evan survived 3 crashes while saving my ankles and toes.

Farewell boots ... Welcome to a brand new pair of TCXs.

The comparison speaks for itself