Cisco CP-CKEM-C= Unified IP Color Key Expansion Module Charcoal, 9971, 9951, 8961 IP Phone Models 4.3-inch 16-bit Color Graphical Display (480x272) 18 physical buttons (36 with page key) Illuminated buttons to determine line status Articulate to match the angle of the IP Phone Compatible with 9971, 9951 and 8961 Cisco IP Phone Models