wristband has sensors for measuring heart rate, skin temperature and perspiration, and tracks your activity and sleep. It also tells the time and looks good.
It comes with a black rubber strap but leather, white or designer options are available too. The companion app is impressive, letting you set a range of goals such as getting to bed on time or walking more than 8,000 steps four days a on to the next.
It works with Apple and Android 4.1+ devices and is only available in the US.