Was already written as in the other reviews, the product is qualitiv quality while priced well below what the market will bear otherwise. When building and the dimensions, there is no criticism - the receiver is installed in a surface-mounted distribution box and thus quite small. The transmitters are also pretty small and easy - the keys are recessed slightly, so that they can not operate accidentally (which could be more of a problem for people with thick fingers ;-) It took the receiver as a substitute / complement for my existing garage door opener, in which the transmitter were broken. Spare transmitter were for no longer procurable. Since the existing drive but also manually (via a simple button / NO) can be triggered, this receiver offered outright. I have to simply cut the conductor tracks that led from the 230V ~ page to the relay contacts, so as to obtain a floating NO contact. The whole thing, I then simply connected in parallel to the shutter button of my existing drive. That was all that needed to be rebuilt. The "programming" is also quite simple - inter alia be the sender "taught" and it may be the relay switch-on time can be adjusted. The whole thing works just fine. I would recommend this product without restrictions.
