Get motivated to move more with Fitbit Charge FB404BKS Wireless Activity Tracker, by tracking all day activity like steps taken, distance traveled, calories burned, floors climbed and active minutes. Charge lets you see every stat as it happens right on your wrist, with a bright OLED display. And, with an industry leading battery life of 7 10 days, you can find the inspiration to beat your goals no matter what the week brings. Built with Caller ID, Charge shows your incoming calls when your phone is nearby to help you take control of your day and your schedule.