STANDALONE ALARM: On-site alarm with siren sounds up to 120dB, paired with door/window sensors, PIR motion detectors to form an effective, standalone security system for apartments .SMALL & PORTABLE: Horn 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.EASY INSTALLATION: Wired sound alarm installation options are flexible and convenient. Usually installed in a wall, door, balcony or other places, the installation height of 2.5 meters or more.You only need to stick when installing, no wiring, it is very easy to use< p>USE WITH YOUR SYSTEM: Audible Alarm This product can be used with your system to respond to signals from the keypad / alarm console. Delivers very loud voice prompts at 120 decibels. This piercing plug-in alarm plugs into your keyboard/console.