The Archon is a completely new controller from Digital Aquatics that is backward compatible with the modules that are sold for the RKL and RKE head units. The Archon system is a huge leap forward for DA and it brings tons of things to the line that the RKE and especially the RKL did not have. By making it compatible with the previously released modules, it keeps your investment in their earlier hardware still relevant. The Archon itself has built in WiFi, temp, two ph/orp ports, 0v-10v ports, switch ports, etc. It is also Linux based and users with the ability to program can make quite a few modifications on their own. The user interface is web based so it works on any web-enabled device be it Mac, Windows, phones, tablets, etc. I have had one since December as a beta tester and can say that it is working great. There are several other folks that have been posting about them here on R2R as well as on the DA support forum.