The app loaded On receipt - no Sync with iPhone possible! Only after some searching found out that the app is only compatible with the Up3 that still does not exist. So "old" app installed uninstalled and the. Synchronization then works exactly 3 days. When recharging should be "off" the device - the ridiculous mini-guide is not to be found, such as turning off the tracker. Then write to customer service a mail, when the successor Tracker Up3 will appear now, for there is already the app and there to admire on the homepage. When asked if the rumors of serious technical problems in manufacturing to financial problems of the company's votes from it. Be advised that I therefore now rather tend to have a Fitbit. Response: zero, great customer service I call something. In addition, account also the D homepage for the Jawbone newsletter on both the US as - response: zero again, which was getting some mail 2 months ago, never. So Tracker goes back to Amazon.