Polycom IP Conference Phone, SoundStation IP 5000 POE, Patented Acoustic Clarity Technology ,SIP Call Platforms Polycom HD Voice makes your conference calls sound amazingly clear and life-like Patented Polycom Acoustic Clarity technology delivers the best conference phone experience with no compromises 7-foot microphone pickup and a small footprint designed for executive offices and smaller conference rooms with up to 6 participants compatible with a broad array of SIP call platforms to maximize voice quality and feature availability while simplifying management and administration Power White LED backlight with custom intensity control Keypad; Dimensions: 11.2 x 10.4 x 2.6 inches ; 1.2 pounds