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Question About AT&T Home Security System AT&T Model 8400 Door Unit
Home Alarm System - Product Date 1986...

Need to find the product manual for this device. Installed in my home in 1987. This unit(s) is attached to all of my external doors. The unit uses a 9Volt battery for power. Primary question, is this a stand alone unit so that any time the door is opened it would trigger an alarm built in the unit?

Asked by John on 06/10/2009 0  Answer

ManualsOnline posted an answer 15 years, 6 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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