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Add up to 36 extra feature keys with the Cisco IP Phone 8800 Key Expansion Module for use with third-party platforms. Compatible with Cisco 8851, 8861, and 8865, this expansion module has a 4.3" color display with 18 physical buttons. Because it supports two virtaul pages of feature keys, you get a full 36 customizable keys. You can connect up to three modules to Cisco 8861 and Cisco 8865, or up to two modules to Cisco 8851.