The Yealink EXP50 Color-screen Expansion Module for Yealink T5 Series IP phones, (includes SIP-T58V; SIP-T58A; SIP-T56A; SIPT54S; SIP-T52S), is designed to expand the functional capability of your SIP phone to a whole new level. • 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 with illuminated LED for fast switching pages • Supports up to 3 modules daisy-chain • Stand with 2 adjustable angles