The Mitel Superset 4150 Digital Telephone is ideal for heavy telephony users who require advanced access to full-featured telephony functions. The 4150 Digital Telephone is perfect for managers, professionals, and call centre agents and supervisors Features 20 Character Illuminated Digital Display Limited Automatic Call Distribution (ACD) Functionality Speed Calling Hold PC connectivity to support TAPI-compliant applications Speakerphone Supports firmware download Transferring Calls Dedicated Headset Jack Conference Calling Tilting Base Wall mountable 14 Personal Keys with Built in Status Indicators 10 Fixed Feature Keys Voice Mail Access (Message Waiting Lamp) 1-Year Warranty Compatibility SX200D, and SX2000