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The Alarm is simply GSM Alarm System and the siren is completely unmarked. Essentially all I need to do is somehow create a negative trigger to activate the alarm when it is meant to go off, which the alarm doesn't have, only 12v +/- for siren connection, as the siren came with its own...

Not a lot - the alarm panel is a cheap generic, and the solar bell box was end of line without tech support. (It does take 8 C Batteries also) They have both been unhelpful!

Hi, Many thanks in advance for any help I'm given. I have a 433mhz Wireless GSM Alarm, which has +/- out 12v for Siren, but has no Trigger connection. I bought a 433mhz Solar Wireless Siren, but it has a transmitter which connects to the alarm, and does not have a button to activate a...