Poor description from Amazon = wrongly ordered

I bought extra boxes these Premium, 2 pcs., In the assumption that one can simultaneously control both boxes with a cell phone since there is also an app to do so. Unfortunately that does not work!
Therefore, I find the price really dead wrong, please correct the description of the product. Always the same on Amazon, important, essential information missing :-(
I have now checked again on the manufacturer's site, supposedly it should be possible to drive with Airplay simultaneously with an i-phone both boxes, play around after an hour but I give up. Extra again to lay a cable from one box to another is really uninteresting.
Therefore both boxes go back - shame as sound very good.