The remote control works fine 30m wide with our Marathon S 550 N. The only complaint (besides the high price): One should have the original documentation of the garage door opener, since there is the summer of different model versions with nearly the same type designation. So I had to program the remote control to open this, in the opener of stuck with their contacts on the ceiling and press a button. I am writing this because I had found the instructions, later on the net and other remarks on sending a Fernebdienungssignals and a button to program the NC and I had tried this first, a long hour by then resume scanning the net for other solutions. The deduction of points on the one hand I justify the high price and on the other hand with the lack of documentation, otherwise I can only recommend the remote control, as it is quite small and served its purpose.