Scala rider G4 headset.

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The scala rider G4 allows up to three separate riders to converse.

The headset offers group intercom between up to three riders at distances of up to one mile, as well as intercom conversations between three separate riders. The G4 can connect with virtually any portable Bluetooth device including mobile phones, MP3 players and compatible GPS units for in-helmet voice instructions. It can also connect with non-Bluetooth MP3 players, the unit has a built-in FM radio and scan and seek features with six-station memory. AGC technology automatically adjusts the headset volume based on ambient noise and riding speed.
Suggested retail price of US$279.95.

Bluetooth Headsets for Helmets ? Cardo Systems, Inc.