Would it be possible for you to send me a picture of this unit? The current unit that I have in my house which I just purchased is model number I M 406 From the information that I've gathered so far it seems to be a six wire system. It has an a.m. FM radio intercom system combination. I checked for power it does have power coming into the unit however it only makes a few clicking noises. Let me know if your unit would be a direct replacement.

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