You can use your Fitbit tracker to see how many hours you sleep and better understand the quality of your sleep. To track your sleep with Fitbit Flex™, simply wear your tracker to bed. When your Flex syncs in the morning you'll see last night's sleep stats on your dashboard.

Make fitness a lifestyle with Fitbit Flex - a slim, stylish device that tracks all-day activity like steps, distance, calories burned and active minutes. See how every day stacks up with LEDs that light up like a scoreboard as you get closer to your goal. Then wear it at night to measure your sleep quality and wake with a silent, vibrating alarm. Day or night, Flex fits comfortably around your wrist, is water-resistant, and has a 5-day battery life. It also syncs to computers and leading smartphones, so you can access your stats anywhere and see your progress in charts and graphs.

Design : When we first picked up the new Fitbit Flex, we initially considered its unadorned surface and clean, ring shape spartan. After all, the device lacks a real screen capable of displaying alphanumeric characters. Instead the Flex sports a thin sliver of a display cut from smoky dark plastic. Underneath the plastic sits a row of five tiny, white LEDs that blink to indicate the Flex's status.

• All-Day Activity.
• Wear + Accessories.
• Progress Display.
• Wear + Life.
• Auto Sleep Tracking & Silent Alarms.
• Wireless Syncing.

Water Resistance : Fitbit Flex is sweat, rain and splash proof. However, the device is not swim proof. We also recommend taking Fitbit Flex off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean.

Performance : The Flex takes from the One is its ability to track the length and quality of your sleep plus how many times you woke during the night. The Flex is much more convenient gadget for sleep tracking, though, since it's already strapped to your arm.

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