RCA 25424RE1 4-Line Expandable Business System Phone w/ Caller ID + RCA DECT 6.0 Accessory Handset Up to 4-Line Operation - Handles up to 4 separate phone numbers Caller ID / Call Waiting screen - Compatible where service is present Expandable Up To 16 Stations - For office or home telephone network Speakerphone Backlit LCD Display (4-Line)