Connecting siren to burglar alarm

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Model: CXG4D, NHG9D, LMG3, LMG3T, LMS3, LMS3D, LMS35D, LMS3D5D, CXG4D5D

Connecting external siren or buzzer to GSM Alarm Panel is easy, first identify the two ports for siren (one as Ground and another one is input) from the back panel of GSM Alarm Panel - they're mostly at the leftmost two ports of the mini-patching panel.

* beware the positive and ground ends of the cord, cannot be reversed

Some packing may have bundled siren with jack, please just detach the jack and let the cord open ends and then it can fit the patch panel.