The Sip Talkback speaker has the ability to attach a 12V light or other signal device when the SIP Talkback Speaker goes off hook.
The SIP Talkback Speaker has a 4 way terminal connector, Relay In and Relay Out.
Relay In – Closing this circuit will result in dialing pre-programmed number. (You can Connect the 433Mhz Controller to this Circuit).
Relay Out – Off Hook, this close the circuit. This is used to turn on a LED light to signify that the talkback is live.
