Viking E-20B Speaker Phone with Push Button The Viking E-20B Speaker Phone with Push Button is a line powered entry phone that provides two-way handsfree communication. The E-20B can be connected directly to a C.O. line or analog PABX/KSU station when programmed as a ringdown circuit. Features Alternate action call button to place or cancel a call Intelligent call progress detection for automatic hangup on CPC, silence, busy signal, or time out Telephone line powered Weather resistant features: mylar speaker, gaskets, internally sealed push button switch, UV stable exterior, enamel coated PCB Adjustable microphone and speaker volume Programmable maximum call length Selectable auto-answer feature allows remote monitoring Two way handsfree communication Programmable VOX (mic/speaker) switching speed Includes Atlas 1-Year Warranty with Extended Warranty options available! Documents Viking E-20B DataSheet