ESI DFP 5000-0531 48 Key Full Duplex Speaker Phone (Charcoal/Refurbished)The 48 Key FD DFP Full Duplex Speakerphone is specifically designed for active users. The ESI 48 Key Phone features a large backlit display. The ESI 48 Key Phone is easy to connect with up to two optional Expansion Consoles, each of which gives you an additional 60 programmable feature keys. Key Features: 30 Programmable Keys Dedicated Voicemail Key Dedicated Help Key Display: Three line, 56 character. Speakerphone Blacklight Display Integrated