i dont think there is one mate, wow 32 years, mine is just over 20 years and has rarely ever caused false alarms and even to this day it can still blow your ears off ,9600 is a good solid sturdy panel its just the best imho, its power supply can almost take twice as much power as these modern panels, basically the 9600 is a tank of an alarm old but the best:) i am more than happy to keep my 9600
edinburghftw30, February 2014