The Poly VVX EM50 Expansion Module turns your VVX 450 into a high performance attendant console. Poly VVX EM50 Expansion Module Features: Large, High Res 5.0″ screen with programmable line keys Color TFT graphical user interface Dual-color red/green LEDs for Line Status 3 Page Keys for additional line appearances Fast Set up, provisioned by VVX 450 Host phone Install 1 or 2 on Poly VVX 450 Ships with console and desk stand.