Thank you RandM-K
I didn't get a copy of any instructions but after reading your reply got a set from the manufacturer. You are correct, it works well, as well as a great improvement to be able to listen to different zones.
So again, excellent customer service & thank you all the for the advise!
2016 Rockwood 2504s
2004 GMC Sierra 1500
Dad to 5 & 2 yr olds who wear me out