Telephone line powered speaker phone designed to provide two-way handsfree communication. Both function identically, but are available in two different housings to better suit the application. When the “Call” button is pressed, the E-10A or E-20B will come off-hook and will remain off-hook until a CPC signal is detected, the programmed timeout has elapsed, a busy signal is detected, or the call goes silent, making the unit automatically disconnect. The E-20B can be connected directly to a C.O. line or analog PABX/KSU station when programmed as a ringdown circuit, or used with a Viking Hot-Line Dialer. If a line or station is not available, Viking�s DLE-200B ring down circuit can be used. One, or up to four, E-10A speaker phones can share an existing phone line in a house or small business when used with a Viking C-200 or C-2000A (respectively) Entry Phone Controllers. For outdoor or harsh environments, the E-10A/20B are available with Enhanced weather Protection (EWP). The E-20B-EWP features rubber gaskets and boots, closed cell foam gasketing, hand soldered silicon sealed connections, anti-corrosive gel filled tip and ring connectors, as well as urethane encapsulated circuit boards with internally sealed, field-adjustable trim POTS and DIP switches.