Work with Fossil, Sony Ericsson presents it Bluetooth watch, the MBW-100. The watch comes with an OLED screen and interact with your phone via Bluetooth, when there is a call, it will show you the caller ID and it will notify you if there is a SMS. It will also alert you if the watch goes out of the Bluetooth range.
It can also be used as a music controller to remote the phone to play music or to stop. It seems the watch has to be charged and for every charge, the bluetooth and only last for 7 days.