Check the listing for details. Yealink EXP40 LCD Expansion Module. Color: Black, Condition: New. Listed at 80.00 USD. The Yealink EXP40 LCD Expansion Module is an advanced add-on designed to enhance the functionality of compatible Yealink IP phones by providing an additional 40 programmable physical keys with clear LCD labels. This module is ideal for busy professionals who need quick access to a large number of speed dials, BLF (Busy Lamp Field) keys, and call handling functions, improving efficiency and workflow in high-volume call environments. Featuring a vibrant, high-resolution LCD screen with adjustable backlighting, the EXP40 ensures ease of use even in low-light conditions. It supports plug-and-play installation, seamlessly connecting to compatible Yealink phone models to expand their capacity without complicated setup. With a sleek, durable design, the EXP40 is perfect for busy offices, call.