ALARM STANDALONE alarm: On-site alarm with a loud siren up to 110 dB, coupling with door / window sensors, PIR motion detectors to form an effective and autonomous security system for apartments.< /p> DURABLE DESIGN: Flame retardant ABS housing, widely used in alarm host, air leak alarm, infrared peripheral alarm equipment This product was designed with the fire protection technology and its housing is fire resistant. SAFETY HORN: The 12V home tweeter can be connected to various alarm systems. When someone trespasses illegally, the horn will sound three times to let you know where the accident happened. EASY INSTALLATION: Installation options are flexible and convenient. Generally installed in the wall, doorway or balcony and other places, the installation height is equal to or greater than 2.5 meters. ALL SMALL &amp; PORTABLE: The product is small, flexible and easy to carry. So you can easily take it wherever you need it, fix it and it will work for you.