1, total 4 wires, 2 wires for power supply, the other 2 wires for triggering wires.
2, once the 2 triggering wires triggered, touch together, the Siren will make sound for the pre-setted time, from ***5 seconds.
3, Sound volume can be adjustable by hands by adjust the circule on the PCB.
4, normal *2V DC, but 6V or *4V can be done.
