DESC: RCA RCA25216 Full duplex speakerphone delivers superior sound quality and clarity. Two line operation with Auto Line Select automatically connects users to ringing or open lines. Compatible with most headsets via 2.5mm jack and hearing aids. Base model plus Bluetooth compatibility lets users make and receive cell phone calls as well as conference calls between cell phones and landlines. Answering System: N/A Lines: 2 Telephone Type: Corded Caller ID/Type: Standard Display.