Cisco CP-BEKEM IP Phone 8800 Key Expansion Module - Black
Up to 2 Cisco 8800 Key Expansion Modules can be connected to the Cisco 8851 IP phone. Up to 3 Cisco 8800 Key Expansion Modules can be connected to the Cisco 8861 and 8865 IP phone. Requires Cisco IP Phone 8800 firmware 10.2(2) and later.