heterodyne:
u purchase GM50 or GM50M?and in the IES cataloq don't have GM55 but got GM55M.i've ask the GM55M plus instalation not more than RM1.3k
GM50 is good but don't have backup battery.
where shop can install this alarm? with reseonable price?..
i also looking for it right now..pm me as well..thanks =)
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