Good idea but poor product,
Verified Purchase(What is this?)
This review is from: Jawbone Large UP Fitness Tracking Wristband - Black Onyx (Accessory)
I really liked the idea behind this product and I found it reasonably accurate for both walking and running. I am not too sure about the accuracy for sleep though. Other users in the family using another Up have found the Up to be inaccurate even after calibration. My main gripe however is the reliability of the devices. Having bought two of them one has a battery that does not hold charge for more than a day although it says 10 days and the other has simply died. Support said they would send a replacement but I am still waiting after a week. I am sure another company could implement this idea better.