DESC: 4 Line Plug and Play Epic Phone System. Non-KSU, Speakerphone with CID, large LCD, Intercom, Expandable up to 16 Telephones. Connect any standard single-line cordless phone to the system, and turn that single-line phone into a multi-line, multi-feature phone by using the optional Cordless Phone Adapter TMC-810-ECA! Four- line phones have never been so easy. This phone is the replacement for the TMC Epic ET4000, and is fully compatible. Both types of phones may be used together in a system. The new model is narrower and has a tilt-up display.