Here is a Bluetooth Headset with an unusual design, it is called the Orb Bluetooth Ring Headset. It was designed by Hybra Advanced Technologies and can be transformed into a ring when not on your ear.
The Orb features a OLED display which displays callers details and even calendar details, the headset uses bone conduction sound transfer which gives the user sound clarity without having to insert the headset into his/her ear. The developers are planning to release the Orb Bluetooth Ring Headset in 2010 in two different versions, the classic and deluxe version. The Classic Edition will be going for a price of $129 and the Deluxe Edition will cost $46 more, setting the price at $175