Hi Guys, I am interested in purchasing several Digitrax UT6 throttles; UT6D Duplex Radio, and/or UT6DE Duplex. I currently have a Digitrax Zephyr DCS52 DCC system. Question - What is the difference between the 3 handheld throttles. Also, do I need a Loconet LNWI WiFi Interface, or can I plug the remote throttles into the back of the Zephyr where it denotes Loconet? I had a LNWI Interface that we used to connect with Engine Driver on Smartphones and I liked the ability to do it while not plugged in. Alas, I lost the LNWI in a flood from Hurricane Ida and checking to see if I really need to replace it………Bob F.