Have 5 additional phones available. Same model Works with Panasonic phone systems Panasonic KX-T7731 Hybrid System Corded Telephone Speakerphone Key with LED Indication 1-Line Backlit LCD Display Back-Lit Keypad Caller ID / Call Waiting 24 Programmable Line Buttons Auto Answer Speakerphone (Intercom) Works With The Following Panasonic Systems: KX-TA 624-4 KX-TA 824 KX-TA W848 KX-TDA 50 KX-TDA 50G ...