When mounting the mic clamps (provided with this item and also available separately as Sena SMH-A0301 Helmet Boom

As I have described above, if the mic clamp is deformed in any way, it affects how the electrical contacts mate up when the intercom is snapped into the clamp

If when you un-snap the intercom (to remove it), and it is at all difficult, this is an indication that the mic clamp is deformed and flattened more than it should be - I would expect some type of problem to develop

You have to replace the provided two screws with longer ones so you can use the 'extra plastic shim piece' along with the thin metal backing clamp - this is what I did and recommend, if your helmet has a contour that deforms the mic clamp in any way when you tighten the clamp screws, or the mic clamp will eventually crack

My experience with SENA Customer Service was excellent and they replaced my cracked mic clamp under Warranty.

/c they will die without warning.

You'll enjoy it as much as we do!

I was very sceptical as to weather we would be able to hear inside our helmets as my bike is very loud