The Yealink EXP55 Color Expansion Module for Yealink T7X/T8X IP phones is designed to expand the functional capability of your SIP phone to a whole new level. It features a large 5.5-inch color-screen LCD, giving you a vivid visual experience. In addition, it provides you with a simple user interface and advanced call-handling capabilities. For example, three pages of 26 flexible buttons shown on the display can be programmed up to 78 various features. The EXP55 will also extend the functionality of Yealink T7X/T8X IP phones, you can set the provided multifunctional line keys as BLF, speed dial, call forward, transfer, call park, call pickup, etc. The Yealink EXP55 Color Expansion Module is an ideal solution for receptionists, administrative assistants, and contact center workers, and gives you the ability to monitor contacts and manage a large volume of calls with ease.5.5″ 480 x 960-pixel color screenColor icons for a rich visual experience26 physical keys on each page with dual-color LEDsThree independent control keys with illuminated LED for fast switching pagesSupports up to 3 modules daisy chainStand with 2 adjustable angles