Up By Jawbone Tracking Wristband - 24/7 Activity Tracking - Inside and Out 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 & drink & track nutritional info Free iPhone or Android app required Large: Wrist size 18 - 20 cm, 23 grams