Function and quality

A test on the speed I have not done, but I can find no disadvantages to my old switch.
The whole is quite fast.
Fits in a little box, only the supplied brackets are unfortunately on a 19 "tuned box. Just saw off and two new drill holes in the angle. Two new angle for a 10" mounting costs about 30 minutes.
Why only 4 stars? The box is whistled very uncomfortable. Absolutely not suitable for living or sleeping quarters. I have this in the boiler room, where he only disturbed my wife while ironing. That I mean seriously, even now she refuses to stay longer than five minutes the room, my dogs are not counted into the cellar since. The whistling is likely well over 20,000 heart lie and can be heard from a distance of approximately 4 to 5 meters.