There are no directions as for where to put the screws (place them in the rectangular holes on the sides of the wall plate, not the circular hole in the middle). I accidently purchased this headset thinking it was a newer model of my SA-903 and. At first, I wanted to return them right away, because tips supplied with earphones are just horrible! I also am so happy after the switch. They have a quality feel. Couldn?t love this more! Had to give them away. research this name. I like the layout of the outlets on the unit and the large number of outlets on it, it fit the situation I needed it to serve when I was searching for a power distribution unit. A bit wide