The Radius 350 corded telephone is the ideal business choice telephone as it has a variety of features that include 70 memories, 16 last number redial memory (32 digits) and a caller ID 70 number memory.Further features of the Radius 150 corded business phone include: 2.5mm Headset socket, speakerphone (Duplex), hearing aid compatible and a 3m extended handset cord and tone/pulse dialling.Speakerphone ( Duplex), Tone/Pulse Dialling