The Yealink EXP43 Color Expansion Module is a fantastic addition to any business phone system. With the ability to add up to 20 phone lines, this corded handset module is perfect for large enterprises. The sleek black design adds a touch of professionalism to any workspace. This module includes features like a speakerphone and Power Over Ethernet (PoE) for convenience. The interface includes USB, DSL/Phone (RJ-11), and Ethernet (RJ-45) for easy connectivity. Enhance your office phone system with the Yealink EXP43 Color Expansion Module today.