Fitbit Flex Wireless Activity + Sleep Wristband, Black

Specifications:

• One syncs automatically and wirelessly to tablets, computers and 150+ leading iOS, Android and Windows smartphones using Bluetooth 4.0 wireless technology. Syncing to computers requires Internet connection and USB port. Syncing to mobile devices requires Bluetooth and Internet connection. Syncing range: 20 feet. Call notifications via Bluetooth 4.0
• Water Resistance: Charge has been tested up to 1 ATM meaning it is sweat, rain and splash proof. However, the device is not swim proof. We also recommend taking Charge off before showering because, as with any wearable device, it's best for your skin if the band stays dry and clean.
• Warning: Do not use if you have a pacemaker or other internal, or implanted medical device. Not intended for use by children under 13. Always consult your physician. Slippery when wet
• We recommend charging your device every few days to ensure you are always tracking. Charge time: One to two hours. Battery life: up to 7 - 10 days. Battery type: Lithium-polymer
• Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices
• Tracks steps, distance, calories burned and active minutes
• Monitor how long and 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
• Slim, comfortable and easy to wear (sold with both large and small wristbands included with an interchangeable clasp)
• Sync stats wirelessly and automatically to your computer and over 150 leading smartphones
• 1 wristband which acts both as an Activity & Sleep wristband. There is no seperate Sleep wristband.