FitbitFitbit Wristband, BlackDetailsTracks steps, distance, calories burned, and active minutes. Monitors how long and how well you sleep. Wakes you (and not your partner) with a silent wake alarm. LED lights show how your day is stacking up against your goal. Easy-to-wear, slim, comfortable wristband. Syncs automatically with select mobile devices and your computer. Accessory bands allow you to personalize your Flex. Set goals, view progress and earn badges. Share and compete with friends throughout the day. Free iPhone app and app for Android. Wear proudly all day and night. Log food, weight, and more on Fitbit's website or apps. It's water resistant, wear it in the shower. Rechargeable battery. Instantly launch your Fitbit app by tapping your Flex on your NFC-enabled Android. Comes with: Flex Tracker, small & large wristbands, charging cable, wireless sync dongle, and free Fitbit account.