Pebble Smartwatch Black View notifications from email, SMS, Caller ID, calendar and your favorite apps on your wrist. Includes Pebble timeline, a chronological display of calendar and notifications Download watch faces and apps to suit your style and interests. Control music playing on iTunes, Spotify, Pandora and more. Rechargeable battery lasts 5-7 days on a single charge Compatible with both Apple (iOS 6 and higher) and Android devices (OS 4.0 and higher) The charging cable's contacts are spring loaded pins. Depress each of them and make sure that they are popping back smoothly up to the same height relative to each other.