The E-40-EWP Series door intercom entry phones are compact, weather and vandal resistant, telephone line powered speaker phones designed to provide two-way handsfree communication. The E-40-EWP compact size allows it to be mounted in a standard single gang electrical box. The E-40-EWP is available in five different attractive finishes to match your door hardware, light fixtures, etc. Replacement E-40 faceplates (PNL40) can be purchased separately and are available in all five standard finishes. The E-40???s blue LED continually provides light for locating the push button in dark locations, dims to indicate off hook and flashes during incoming ring. Note: LED not available on all models. Contact Viking for more information. The E-40-EWP entry phones can share a single phone line with house or small business telephones when used with a Viking model C-200, C-250 or C-2000B Entry Phone controller. The E-40 entry phones 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 model K-1900-5 or K-1900-30 auto dialer. The E-40-EWP features microphone and speaker volume controls, selectable auto answer for monitoring and intelligent call progress detection for automatic hang-up when the call is completed. For outdoor installations where the unit is exposed to precipitation or condensation, the E-40-EWP Series comes with Enhanced Weather Protection (EWP).