There problem with these are that if you put them in your switch boxes is that these have to be very deep. The traditional existing switch is already occupying

There problem with these are that if you put them in your switch boxes is that these have to be very deep. The traditional existing switch is already occupying half of the box and the rest is often not deep enough. The author fixed this by installing new shallow switches. If he is lucky their covers matches these of all the other sockets and switches in the house. In my cases that combo did not work