cheap, unreliable, barely added value

+ Runtime, approximately 1 week has passed and I still have 80% battery charge
+ Leichtschlafphasenweckfunktion. Up to 30 minutes prior to the desired time ..... if it would work because, see drawbacks.
+ Vibration at Handynotifikationen and calls .... if it works because (in my case often not)

- I suspect that the orientation of the sensor capsule plays a role. Since the instructions are spartan has never opened up to me.
- Before the app can be used it is necessary to register on the website. Later in the operation of the app you can, although the Internet connection caps, but I think that's outrageous, especially since the app demands many permissions for access to personal information. At the latest when a firmware update is to reconnect to the Internet and who knows then migrate the data into the grid.
- The tape could not be found by phone several times, until the umpteenth start.
- After the synchronization of the data can be found in the app only from the current day / night the details, ie time / duration of the phases and activities. From the days before each only a summary.
- Several times did not recognize that I wore the tape during sleep
- Sleep onset and end were not always properly recognized, especially if you take a night leaves the bed.
- You can manually correct sleep onset and the end though, the captured data is then not reinterpreted.
- Wake: I was felt awakened shortly after I became awake by itself. Now of course it is questionable if I would not have gone back to sleep without vibration. Rested I have not felt quite the opposite is the case. In one case, it did not wake me up. Either the vibration was tipped harmlessly out or slept again.
- The band I have seen rather as a foreign body to fall asleep, it prevented me from falling asleep.
- In the bedroom, the band has moved last night so unfavorable that it has pulled the trigger my wrist, hopefully without sequelae. Even after a day without a band I feel always at the point still pressure, pain and tingling. In my eyes it is a health risk. At night I'll never wear it again.
- The representation of light sleep, deep sleep and awakenings in the app is nice, but let's face it. What should I deduce from this information? How can I optimize my phases? Should I give to friends so? Following the motto: "Look, my deep sleep duration was much longer than your"
- I have not used it during the day as a pedometer because I like knowing imagining how much I move. Who needs for such a device, which probably lacks the healthy self-perception.

Finally:
The only value I would see as a light sleep phase alarm clock, compared to other products with this function, the tape is unbeatable. However, I feel it on the wrist as disturbing and in the function to be unreliable.

Suggestion:
I would like the band at night worn on ankles .... but only if the alarm would work reliably.

Overall, this type Tracker / Fitness bands in my eyes are a completely nonsensical hype. That I fell for it I still do not understand ...