As with most electronics devices, you need to charge the Pebble for several hours before you use it. Then download the Pebble app to your smart phone. Next, pair the Pebble with your smart phone via Bluetooth. With my Droid Razr Maxx, pairing went without a hitch.
You let the Pebble know what kinds of notifications you want by touching the gear icon in your phone’s Pebble app. Possibilities include one or all of your various e-mail accounts, SMS texts, Facebook messages, and Google Talk and Hangout messages.
The Pebble alerts you with a quick, nearly soundless vibration. Check the watch face to see who’s calling (and decline the call, if you want), the subject header and a few lines of an incoming e-mail, or a text. You can scroll down to read more and to see prior notifications. They disappear after a few moments.
From within the Pebble’s phone app, you can select from various watch faces to personalize your Pebble. You’ll find other Pebble-enabled apps in the Google Play or Apple App Store, most of them pretty basic.
One I tried was Glance for Pebble, an alternate watchface that shows time, day, date, and weather, and also lets you see detailed calendar entries and send preconfigured texts (for example, "I'm driving right now"). I also tried Pebble Bike, which sends speed, distance, and altitude data to your Pebble using your phone's GPS. It will be interesting to see what other kinds of apps developers will come up with.
You can also specify which music service you use and control what you’re listening to on your phone through the Pebble.
Battery life is about a week. The Pebble uses a magnetic charger; you can charge the watch on a computer or with a USB wall charger.