Siemens optiPoint 500 Advance Phone - Refurbished - ManganeseNineteen feature keys with LEDs provide single button access to commonly used features (such as speed dialing numbers), outside lines and other extensions Integrated USB jack for efficient and cost effective CTI applications Back lit display (tilts, with 2 lines x 24 characters) Integrated headset jack Full duplex, hands free speakerphone optiGuide feature navigation keys Two volume control keys Two modular bays for Easy add adapters Works with Hicom