QDI Replacement Wristband with Metal Clasp for Fitbit Flex Activity & Sleep Tracker (No Tracker) (Green, Small)

It is a revolutionary system designed to help you manage your weight, sleep better, and stay fit
Activity monitoring; intelligent wake; sleep monitoring; rest remindering; calorie consumption; incoming call alert; idle remindering
Compatible with many phones equipped with Bluetooth 4.0 and running Android 4.3 or later, and iOS 6.0 or later

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

Standards: IEEE 802.11 a/b/g/n/ac
Security: Support 64/128-bit WEP, WPA-PSK/WPA2-PSK, 801.1 X
Frequency Band: 2.4-2.4835GHz, 5.180-5.825GHz

Turns your favorite wired headphones into wireless ones
Big buttons for common device controls; perfect for exercising
Built-in echo/noise cancelling microphones w/titanium drivers