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Viking Secure Touch Tone Relay Controller. Secure control of high security building entry systems. Door strikes and gates in conjunction with door boxes (W-1000, etc.), entry phones (E-10A, E-20B, E-30, E-40, E-50, K-1700-3, etc.) or hot-line/panel phones (K-1500-7, K-1900-7, etc). User touch tone programmable. Non-volatile memory - retains programming during power outage. 6 digit programmable security code (to access programming). Switchable 32V talk battery. Programmable relay activation time. Programmable relay activation code (1-2 digits or ). Operates on any 12-24V AC/DC power source. LED's for power / relay activation. Programmable allow / restrict for dialing from entry phone. Programmable allow / restrict for keyless entry from entry phone. 32 keyless entry codes. Trigger input for contact closure from postal lock, request to exit, etc.