Jawbone Small UP Fitness Tracking Wristband - Black Onyx UP is compatible with the Amazon Fire phone and devices running Android 4.0 (Ice Cream Sandwich) or and iOS 6.0 Designed to be worn 24/7, with up to 10 days of battery life Track your sleep: total hours; light versus deep; length of time to fall asleep Track your activity: steps; distance; calories burned; time spent active versus idle Log what you eat / drink & track nutritional info