i knew alarm guy would clarify,we buy in new bell boxes and put then through a bench test,hot,cold,short circuit,voltage over load,under load,we freeze them,soak them,only if they pass our tests do we use them,it cost money,but,our test eliminates the dross,so in the long run,we save money,we bench test all our panels,pirs,door contacts,panic buttons,vibe detects,even our batteries,that is why we have few call outs to our systems,most are user faults,so,if you replace your sounder,buy a descent one,
gts, May 2011