Simply tap your Flex band on your Android phone and it will automatically launch the Fitbit Android app.

ENGADGET: Fitbit updates Android app with wireless syncing over Bluetooth 4.0

Shown off here at CES 2013, the Flex is a wireless band much in the vein of Nike's Fuelband and Jawbone's rebooted Up.

ENGADGET

If you've been monitoring the fitness-tracking space, but have been holding out for a band that offers just a little extra, then it's worth considering the Flex.

ENGADGET