The Cisco Unified IP Phone Expansion Module 7914 extends the capabilities of the Cisco Unified IP Phones 7960G, 7961G, 7970G and 7971G-GE with additional buttons and an LCD display. With this expansion module, you add 14 buttons to the existing six buttons of the Cisco Unified IP Phones 7960 and 7961G and the existing eight buttons of the Cisco Unified IP Phones 7970G and 7971G-GE, increasing the total number of buttons when you add one or two Cisco Unified Expansion Modules 7914. You can use up to two Cisco Unified IP Phone Expansion Modules 7914 with a Cisco Unified IP Phones 7960G, 7961G, 7970G or 7971G-GE. When adding the CP-7914 expansion module, a replacement footstand (CP-SINGLFOOTSTAND ou CP-DOUBLFOOTSTAND) and an additional power supply (CP-PWR-CUBE) are required (see below) !