Similar to other movement-tracking fitness gadgets like the Fitbit, the Jawbone Up has a motion accelerator to sense movement. Jawbone calls this one the MotionX engine, and the wristband is designed to be worn all day long. The Up is durable and water-resistant, so you can wear it in the shower as well. Jawbone claims that the Up has up to 10 days of battery life
The Up iPhone app tracks your daily activity (pace, steps, calories); your sleep patterns; and even what you're eating (you take a picture of the food with the app) in a "ME screen" along with a "Lifeline" chart. After you've captured the photo of your meal, Up will notify you a few hours later to ask how the food has affected you.
The band resembles a bulkier version of those yellow Livestrong bracelets, and keeps track of all your activity and sleeping patterns thanks to the motion-tracking engine and other sensors. The companion app then asks for photos of your meals and answers to a few questions about how certain foods make you feel. The idea is to collect as much data as unintrusively as possible to then create, as the company puts it, "a complete, holistic view of your health" that can be accessed from the app at any time.