This QI receiver is processed very well and extremely flat, so it is not really noticeable under the battery cover of the Galaxy Alphas.
Unfortunately, the manufacturer specifies only that the recipient fits under the battery cover, but not that it will only fit under the factory cover.
Once in my case a Flipcover from Samsung is used, the receiver does not work, because the cover is now unable to attach. There are two pins, which used the cover also occupied by the receiver and that's not ... Too bad eigtl.
