I have ordered the part and go home.
So, I'm happy and the part does what it should :-)
But:
If you use a low-cost power supply or a mobile phone (200mA output) is actually after about 2:50 meters final with reception -> the have even tried.
Subsequently, a power supply with 500mA output and lo and behold it works even at a distance of approximately 5.00 m :-)
Star deduction because something has to be noted in the manual!
By the way for all who do not know: The LED is not permanently but only when a signal is sent !!!
