Yealink EXP50 Colour-screen Expansion Module for Yealink T5 Series IP phones, Yealink T53/T53W/T54W/T57W/T58A, T56A/ T58A/MP56/MP58/MP58-WH'Color screen Expansion Module By connecting the EXP50 to a compatible Yealink Teams phone, the module support showing up to 20 contacts on each page for speed dialing or call transfer, while the status of the contacts are synchronized and presented with the color of the presence LED. Features 4. 3'' 272 x 480 pixel color screen Color icons for rich visual experience 20 physical keys on each page with dual color LEDs Three independent control keys