Image: Fitbit
The makers of the Fitbit Flex have updated their popular model.  The company's newest wearable activity tracker is called the Fitbit Force and while it has most of the features of the earlier model, it also adds a couple of key features like an improved blue OLED screen, an altimeter, a clock and a stopwatch.  Fitbit have also added the ability to sync the unit with your phone automatically via Bluetooth.  Good things all round.