The Panasonic KX-TG5571M 5.8GHz FHSS GigaRange Digital Cordless Answering System has more built-in functionality than some mobile phones. With its 5.8GHz Frequency-Hopping Spread Spectrum(FHSS) technology you"ll always have a strong, clear signal. The Caller IQ compatibility provides access to everything from new rings to lottery results. The handset is expandable, allowing up to 8 on a single phone connection. The All-Digital Answering System helps you get every message, every time. With this Panasonic phone the world is at your disposal, from any room in the house. Light-up indicator with ringer/message alert Selecable Ringtones - 3 tones, 4 melodies Ringer Melody Download on Base & Handset 50-station Caller ID memory and dialer 50-station phone book & dialer Chain dial Intercom Lighted handset keypad Up to 4-way conferencing 10-station speed dialer Phone book sharing Redial for last 5 numbers on base & handset Caller IQ compatible Expandable for up to 8 handsets Wireless network friendly Customized ringer USB Port for downloading pictures, ringers wallpaper Dual keypads and speakerphones on base & handset Ringer, talk & volume control on handset Hold/Mute/Flash buttons Headset jack and belt clip included Wall mountable Reversible handset charging Replacement battery - HHR-P104