Iztor 12V Car Van Truck Horn 6 Tone Loud Security Alarm Siren 6 tone car alarm siren,Easy to mount with screws Compatible with most of car alarms,Material: ABS plastic,3-hole mounting base Diameter: about 10cm,Height: about 10cm,Working voltage: DC 6V - 12V,Sound level: 110db Wire length: about 35cm,Color: black Connect the red wire to the postive pole and the black wire to the negative pole