This is the Citizen VIRT W700 Bluetooth watch. The W700 can sync with your phone via Bluetooth and offer on-screen caller ID in an OLED screen and vibration when there is a new incoming call.
The backlit display also flips out if you wander too far from your mobile, essentially doubling as a nifty cellphone finder after a long night of partying, and considering that a full charge will last you around five days, you can survive a week off without your AC adapter.
