Handset Came in - Panasonic KX-TGA450B 5.8GHz 4-Line Additional Handset for KX-TG4500B

http://www.zalmar.com/detail-Communications-Cordless_Phones-KX_TGA450B.htm

Features:
Cordless FHSS Handset for KX-TG4500B
5.8 GHz Frequency Hopping Spread Spectrum (FHSS) Technology
Call Waiting Caller ID
30-Station Handset Caller ID Memory & Dialer
50-Station Handset Phone Directory & Dialer
2-Way Intercom/Paging
Up to 3-Way Conferencing
Backlit Multi-Function 3-Line LCD
Navigator Key
Lighted Keypad
2.5mm Headset Jack
Transfer/Conference/Hold Buttons
3-Level Handset Volume Control
Selectable Ringtones
Adjustable Ringer
Hold/Flash/Pause/Redial
Handset Speakerphone
Charging StandReplacement Battery HHR-P104