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The E-10A and E-20B are telephone line poweredentry phones designed to provide two-way handsfreecommunication. Both function identically, butare available in two different housings to better suitthe application. When the Call button is pressed,the E-10A or E-20B will come off-hook and willremain off-hook until a CPC signal is detected, theprogrammed timeout has elapsed, a busy signal isdetected, or the call goes silent, making the unitautomatically disconnect.The E-10A/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 Dialer. If a lineor station is not available, Vikings DLE-200B ring down circuit can be used. One to four E-10A/20B speakerphones can share an existing phone line in a house or small business when used with a Viking C-200, C-250or C-2000B Entry Phone Controller.The E-10A-EWP and E-20A-EWP shares all of the features of the E-10A and E-20B in addition to EnhancedWeather Protection (EWP) for outdoor installations where the unit is exposed to precipitation or condensation.EWP products feature foam rubber gaskets and boots, sealed connections, gel-filled butt connectors, as wellas urethane or thermal plastic potted circuit boards with internally sealed, field-adjustable trim pots and DIPswitches for easy on-site programming. For more information, see DOD# 859.