I had no idea what this was, just saw the reduction then found myself quite intrigued about what this actually does:
The Jawbone UP smart wristband connects to your smartphone via the 3.5 mm Simple Sync connector to monitor your eating, moving and sleeping habits. Using this unique tool you'll gain new and immediate insights into how you sleep, move and eat, which will help you make smarter choices.
The UP app that accompanies the device displays movement and sleep information, celebrating milestones (like how far you've run or walked, or how many days you've slept properly) and challenges you to improve every day.
A vibration motor powers a silent alarm clock which reminds you to get up and starting moving.
There's an App! (Android and iOS).
By the way, I saw this deal in store (Wolverhampton also). You may catch other colours in your local store.