The Cisco IP Phone 8851/61 Key Expansion Module extends the capabilities of Cisco IP Phone 8851, 8851NR, and 8861 models with additional buttons and a color LCD display. This key expansion module adds 14 physical keys with access to 14 additional keys, using the page keys, for a total of 28 additional keys. You can connect up to three 8851/61 Key Expansion Modules to the IP Phone 8861 and up to two 8851/61 KEMs to the IP Phone 8851 and 8851NR.