The Avaya J100 Expansion Module extends the number of call appearances and feature buttons on the Avaya IP J179 Phone. Each expansion module provides 24 additional buttons for incoming/outgoing calls, for features such as autodial, for dialing contacts, or for other applications. Specifications: ▪ 4.3 inches, 272 x 480 pixel color display. ▪ The Avaya IP Phone J179 support up to 3 button modules, and each button module can take both Stand and Wall mount positions together with the phone. ▪ The J100 Expansion Module provides access to up to 24 buttons and lamps with ability to display 3 pages when a single expansion module is used. ▪ Each feature/line button has a red/green indicator