OK Have a look at this, This is the Sony Ericsson Bluetooth Watch, and you would think why Sony Ericsson might release a watch ? Its not just a watch, its much more, it has a single line OLED display, it displays the Incoming call's Caller ID, your messages, contol the music, vibrates when phone is out of reach and all this using blutooth pairing with your bluetooth enabled Sony Ericsson Handset, too bad the watch itself doesn't function as the phone

Bluetooth Watch