... DC 12V Static Current: ≤20mA Alarm Current: ≤400mA Wireless Receiving Frequency: 433MHzAnti-interference: 1V/m frequency:20-1000 ... The other port of siren to be connected to ground.6.GND: power ground.The packing of wireless alarm system ... the Wireless Alarm System Kit,Siren,Metal Remote Control,Wireless Door Sensor,Wireless Panic Button,Wireless Smoke Alarm,Wireless PIR Detector,Wireless Outdoor ...