The Yealink EXP50 Color-screen Expansion Module for Yealink T5 Series IP phones, including 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.It features a large 4.3-inch color-screen LCD, giving you a vivid visual experience. In addition, it provides you with a simpl...