Product Description When adding the CP-7914 expansion module, a replacement footstand & an additional power supply are required. If one CP-7914 is being added, a CP-SINGLFOOTSTAND & a single power supply (3RD-PWR-CUBE or CP-PWR-CUBE) is needed. If two CP-7914's are being added, a CP-DOUBLFOOTSTAND & two power supplies are needed. The only tool required for installation of the Cisco 7914 is a flat blade screwdriver or other appropriate tool to unlatch the pins securing the standard footst&. About the Cisco CP-7914 Expansion Module: The Cisco IP Phone Expansion Module 7914 extends the capabilities of the Cisco IP Phones 7960G, 7961G, 7970G & 7971G-GE with additional buttons & an LCD display. With this expansion module, you add 14 buttons to the existing six buttons of the Cisco IP Phones 7960 & 7961G & the existing eight buttons of the Cisco IP Phones 7970G & 7971G-GE, increasing the total number of buttons when you add one or two Cisco 7914 Expansion Modules. You can use up to two Cisco 7914 Expansion Modules with a Cisco IP Phones 7960G, 7961G, 7970G or 7971G-GE. The large LCD display of the Cisco IP Phone Expansion Module allows for quick & easy identification of associated buttons. Using the Settings menu of the host IP phone you can adjust the contrast of the individual LCDs for the phone & the expansion module according to your preference. The 14 buttons on each Cisco IP Phone Expansion Module 7914 can be programmed as a directory number (DN), line key, or speed-dial key, much like the Cisco IP Phones 7960G, 7961G, 7970G & 7971G-GE. When used as a DN key, buttons are illuminated, allowing easy identification of call state.