Panasonic KX-TGA272S 2.4GHz Accessory Handset for KX-TG2700-Series Expandable Phones (Silver) 2.4 GHz frequency-hopping spread spectrum technology Caller ID/call waiting For use with Panasonic KX-TG2700S, KX-TG2720S, KX-TG2730S, or KX-TG2740S Built-in speakerphone and clock with alarm 1-year limited warranty