After delivery, we realized that we had mistakenly only ordered the receiver and no set. Then we asked the seller to exchange. He suggested that we order in addition to the matching transmitter and the difference (receiver + transmitter to set) to be transferred back. That worked perfectly! Lots of good tunes, easy handling and no loss !!! Oh yes, the receiver is in the hallway (Mitte) and the transmitter outside the front gate! And the best thing we had to pick any Electrician! Recommended seller and goods very !!!