I use a viper rs121 bluetooth flip up front and built in dark visor, it can answer phone calls, connect to mp3, sat nav etc also enables you to speak rider to rider �150 Ebay

or they do a cheaper version the rs101 does everything the rs121 does apart from you can only listen as it doesn't have a built in mike, �100 Ebay

please note i find this helmet quite heavy, battery only last a couple of hours because you need to have it on full volume to here anything, so i opted to remove the baffles from my ccc's:CCC: and listen to those beauty's sing.

To be honest I find the viper not that good.

hope this helps Gaz h