Panasonic Telephone Systems KX-TA824 Advanced Hybrid Telephone System,   3 CO's, 8 Stations, Expandable to 8 CO's, 24 Stations, CallerID Included (if subscribed to CallerID service). Telephone Compatibility KX-T7700, KX-T7300, KX-308XX, KX-T7000 series, KX-T7885, KX-TD7895 & KX-TD7896 as well as single line telephones.   KX-TAW848 Advanced Hybrid Wired/Wireless Telephone System, Capacity up to 8 CO's, 24 wired stations, 48 using DXDP, CallerID (if subscribed to CallerID service) and Built-in Voicemail Included. Telephone Compatibility KX-T7700, KX-T7300 and KX-T7000 series, KX-T7885, KX-TD7895, KX-TD7896, KX-TD7680 & KX-TD7690 as well as single line telephones