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. Features 20 physical keys each with a dual-colour LED 20 additional keys through page switch 2 independent control keys are used for fast switch pages supports up to 6 modules daisy chained (for a total of 240 extra keys) 160x320 graphic LCD with 16-level greyscale Powered via the host IP phone Stand with 2 adjustable angles Wall mountable