Sony's SBH52 Smart Bluetooth clip acts as your secondary handset
 

HTC may have its Mini Bluetooth handset, but Sony thinks such implementation works best as a big clip without the numeric pad. Dubbed the SBH52, this splashproof device comes with FM radio, a headphone jack plus a small OLED display to show caller ID and text messages, so in a way it's similar to its predecessors. What's new is that you now get NFC as well as an earpiece -- the latter lets you use the clip as a mini phone. Expect to see this on the shelves in Q3 this year.

http://www.engadget.com/2013/06/25/s... ign=Engadget