The E-40 series entry phones are compact, weather and vandal resistant, telephone line powered speaker phones designed to provide 2-way handsfree communication. 1-4 entry phones can share a single phone line with house or small business telephones when used with a Viking model C-2000A. The entry phone can also be connected to an unused analog station port (programmed for ring down) on a phone system or connected directly to a telephone line when used with a Viking K-1900-5.