ATOPIA (NOT ORIGINAL) 2 PCS Small Size Replacement Fitbit Flex Sleep Wristbands Sport Arm Band Armband With Clasp for Fitbit FLEX Only-Black+Slate Color(Tracker not Included)

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The first smart bracelet with OLED,recording sports data daytime and sleeping data in night to guide healthy living.
Host comes with a standard USB port, special design to charge through connecting PC and mobile driver.
Easy to charge via USB port, very slight only 20g and ignore its existence after waring.

ERI is a newly design smart wristband for fitness: It can track your steps, calories, distance automatically. You can wear it to run, swim, cycle, climb. At night, it tracks your sleep quality and wakes you up silently in the morning. You can watch time, temperature, and how the goal you have achieved on the display. Even more, you can bring more features with ERI SDK
Motion Type Recognize Automatically: With DigiCare’s intelligent algorithm, ERI can recognize regular motion type automatically. When you are walking, running, swimming, cycling, climbing, sleeping, ERI will record the duration for each motion type and show on the App
Sync your stats, See your progress: ERI automatically sync your date to iOS devices and select Android phones without plugging in or pushing buttons. This gives you real-time access to your stats on the DigiCareMobile throughout the day

Be compatible with smartphone,iPhone,IPad; Bluetooth 4.0
Syncs automatically to your smart phones and tablets via Bluetooth 4.0
Track Sleep including total hours, time to fall asleep,number of wake ups