Versatile Touch Panel Design
for Seamless Global Business
Communication
Yealink T4 Series Expansion Module: Add More Functionality to Your Yealink IP Phone
Expands the functionality of your Yealink IP phone Adds 20 programmable keys Supports up to 6 modules daisy-chained 160×320 graphic LCD with 16-level grayscales LCD Backlight Two page views are possible