UP by Jawbone - Medium - Retail Packaging - Onyx (847912008980) Designed to be worn 24/7; 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 &amp; drink &amp; track nutritional info, free iPhone app required;   Use the provided USB cord to charge the Jawbone UP with your computer The item is of UP Generation 2