Unfortunately I had to notice that the bell with me did not work, so I've disassembled completely and had a cable that ran to the receiver in selfmade work solder because it is demolished. If it does not work then I would have returned it.
Up to that fact for the price totally inordnung. I just hope that is not ordered the bell in the area, since the frequency is not adjustable and in a city it could otherwise lead to false tripping.