Bluetooth helmet

BMW came up with a multi-functional Bluetooth helmet using which you can talk to a passenger sitting behind you or another rider that’s less than 30 feet away. It has a simple three-button control panel on the outside of the helmet, and you can hook it up with a Bluetooth phone or MP3 player, or listen to directions from a GPS system.

Source:
No more cables! WCS-1: the new Bluetooth® communication system from BMW Motorrad. For one and two persons.