I’ve noticed a lot of competitors on the TdeF this year wearing Bluetooth type ear/mic pieces. I’m wondering if these are just to receive information from the team cars & managers or whether the individual team members can talk to each other directly. If so I guess this would be some kind of radio link and I would be interested to know exactly what they are using. Earlier this year I did a far more casual tour down through France with 3 friends and we seem to be constantly having to shout to each other and repeat things. Some kind of neat lightweight Bluetooth type device to communicate with could be very useful. I know that something like that is available for motor bikers but they are a bit bulky and the ear pieces fit inside the helmets. I would be interested to know of anything out there similar and suitable for cyclists.