Here Here GTS, If you install the correct equipment in the first place you should not have false alarms, You could fit 2 x Dual Tec's in parallel if its a really hostile place, Really depends if it needs to be Graded or not, Double knock is an option,
Ive just realised youve bought a pile of junk, So its a case of disconnecting it, putting it in a rubbish bin, and start again with a proffesional system.
Nick, January 2012