Features: 12V 150 dB treble speaker,far volume,and dual tone, can be worked with various alarm connection. When someone breaks in illegally, the alarm horn will issue a three alarm to let you know where the accident happened. ABS fire-retardant shell,widely used in alarm host,gas leakage alarm, infrared peripheral alarm equipment, etc. Installation options are flexible and convenient.Generally installed in the wall or doorway or balcony and other places by using screws, the installation height of 2.5 meters or more. Strong and durable, small and light, long service life. Specifications: Product Type: Dual tone Siren Product Model: BRJ-625 Operating Voltage: DC 12V Rated Power: 30W SPL: 150 dB Sound Type: 2 tones , Dual tone, Magnet: Ferrite Voice Coil:33.5mm Size: 20*12.5*23cm/7.9*4.9*9.1in Package Weight: 881g/31.1oz Package List: 1* DC12V Alarm Siren . Note: Connection method: The red wire is the positive pole; the white wire is the negative pole and also the common terminal; the yellow wire and the red wire are connected to the alarm.