Motorola MD471 2.4 GHz Digital Expandable Cordless Speakerphone with Caller ID (Silver) 2.4 GHz digital signal; expandable to 4 handsets Caller ID; 50 name-and-number memory in handset, 49 in base Dual speakerphones, full-function base 3-way conferencing, intercom, walkie-talkie function Illuminated keypad, 4-line LCD, desk or wall mounting