I currently have an ADT hardwired security system; that is, the door sensors, motion detector, glass breakage detector, etc. are hardwired into the control unit rather than being wireless as the X10 system is. As I want to eliminate the monthly monitoring fee charged by ADT I am considering installing an X10 system; however, in reading many reviews, it seems to me that wireless routers, cell phones, cordless phones, garage door openers, etc. may interfere with the X10 signal, thereby giving false alarms. To avoid or minimize false alarms, it occurred to me that perhaps I could still use my ADT system, but rather than it calling the ADT monitoring service, it triggers the PS561 which would then call the numbers I have programmed into it. Since I have never owned a PS561, I don't know if it is possible to use the output of the ADT system that drives the siren to trigger the PS561. I am unable to find anything online about it, and the contact I made with X10 didn't know either and suggested I go to the forum. I searched the forum but have come up empty. Does anyone have the answer?