An update on the interphone f5.
Installation is a doddle, takes about 2 minutes, the harder bit was deciding where to stick the unit. (Schuberth c3 flip front helmet)
Pairing, again, an absolute doddle, now can listen to music stored on phone, or make a call via voice activated, the unit talks to you, to tell you whats selected, which is really easy to navigate.
The only issue, is if your listening to music, you seem to have to turn it off to turn the intercom on, you cant just talk.
But apart from that, highly recommended.