Panasonic KX-TG6054B 5.8 GHz FHSS Expandable Digital Cordless Phone System with 4 Handsets Advanced digital cordless phone system with four handsets and 5.8 GHz frequency-hopping technology Intercom between handsets Will not interfere with wireless networks such as 802.11b or 802.11g WiFi Talking caller ID (service is required for use); built-in 18-minute digital answering machine Light-up indicator with 3 color options