The reason I added the button to the diagram was because the SX being powered all the time was causing issues outputting video when docked. Someone else has done this install as well and didn't have the same issue. So the answer is yes and no. Try it without a button and if you experience the same issue then add in a button. Check this thread for more info: https://team-xecuter.com/forums/threads/154119-Internal-SX-Pro-DongleAlright But Is It Required Or Optional?