This is a WE464 E/G. Now I am selling it as a single line set and it will not light up - that requires something called a KSU (key server unit, the old business system). It will work great and dial out. If you want to obtain a "shoebox" KSU and have a great deal of knowledge it could be wired to work (it's all there!). But it will ring, dial out, receive, and transmit. And it's very cool.