W
whistle
I've been using Vipers/Shockguard for over 20 years and never had a faulty one yet. BTW they cost less than a tenner. I'd link it out for a few days if I were you.
you have no way of knowing that - are you actually saying you have NEVER had an alarm from a shockguard in over 20 years - "just turned it down guv, honest it`ll still pick up an intruder" - madness.