AUTONOMOUS ALARM alarm: On-site alarm with a powerful siren up to 110 dB, coupling with door / window sensors, PIR motion detectors to form an efficient and autonomous security system for apartments. DURABLE DESIGN: Flame retardant ABS housing, widely used in alarm host, air leakage alarm, infrared peripheral alarm equipment This product was designed with protection technology against fire and its housing is resistant fire. SAFETY HORNS: The 12 V home tweeter can be connected to various alarm systems. When someone interferes illegally, the horn sounds three times to indicate the place of the accident. EASY INSTALLATION: The 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 PETIT & amp; PORTABLE The: The product is small, flexible and easy to carry. So you can easily take it where you need it, fix it and it will work for you.