DESC: Seamless interaction between business two-way radio and cordless functions. Two-way radio range - up 200,000 sq. ft or 15 floors indoors, 5 miles outdoors (range will vary based on terrain and conditions). Cordless phone range - up 100,000 sq. ft around the phone base. Expandable functionality - a single base station (with a single, unique phone number) supports up to four CLS1450c handsets (must be connected to an analog phone line). An unlimited number of business two-way radios (must be set to the same frequency and code) can interact with the CLS1450c. Cordless phone capabilities - including Caller ID with Visual Call Waiting**, speakerphone, programmable phone book, outbound call lock programmability, and more.