The EXP40 Expansion Module can be used with the Yealink T46GN and Yealink T48GN desk phones. It has a large graphic LCD display, with two pages of 20 flexible function buttons each with a dual-colour LED for line status information. Up to 6 of the Yealink EXP40 can be daisy chained together making it ideal for busy receptionists who need to be able to see who is available and transfer calls quickly and efficiently.