I am selling and alarm system that goes on the controls one end from the pc into the alarm and the output to the first control. there is a plug that goes in the last control to return the signal to the alarm. If the line is opened anywhere between the alarm and the last control the alarm will sound until it is turned off. I am selling the unit for $70 plus shipping if anybody is wanting one pm me, paypal is accepted only and will be shipped out once payment is received and mailing address is confirmed. The alarm can be viewed and watched at youtube under user Lowinhz
pm if questions or wanting one