The watch is infinitely customisable, with downloadable watchfaces and internet-connected apps.
Pebble connects to iPhone and Android smartphones using Bluetooth, alerting users with a silent vibration to incoming calls, emails and messages.
Cyclists can use Pebble as a bike computer, accessing the GPS on the smartphone to display speed, distance and pace data.
Runners get a similar set of data displayed on their wrist.
Pebble can also be used to control music the phone with the touch of a button.
To dismiss a notification a user can just shake her wrist and it is also easy to disable all notifications.
The Pebble works with iPhone 3GS, 4, 4S, 5 or any iPod Touch with iOS 5 or iOS 6. Android devices running OS 2.3 and up but Pebble does not work with Blackberry or Windows Phone at this time.
The rechargeable battery keeps Pebble going for over 7 days.
Pebble has a backlight to view the display at night.
Pebble is also water resistant and has a scratch and shatter resistant lens with an anti-glare optical coating.
Pebble is designed to fit most 22mm watch bands. The watch is available for pre-order from getpebble.com at $150.
The makers of Pebble call it the first watch built for the 21st century.