Just to come back to this issue.
This whole helmet purchase (two helmets, two SC1 advanced) is becoming a real frustration.
Just as a warning to fellow motorcyclists:
Don't let the reputation of the brand fool you:
The helmet is noisy, the ventilation on top catches turbulent air and whistles as a steam cettle
The SENA communication system is a letdown:
complicated to use, for setting it up you must use combinations of pushes on tiny buttons (try to remember them all)
virtually impossible to use with gloves
user manual should get a reward for explaining the most simple things a complex as possible
If onlythis stuff would not be so expensive, I could throw it away