STANDALONE ALARM:On-site alarm with loud siren alerts up to 120dB, pairing with door/window sensors, PIR motion detectors to form an effective standalone home house apartment security system. SMALL & PORTABLE: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. EASY INSTALLATION: Installation options are flexible and convenient.Generally installed in the wall or doorway or balcony and other places, the installation height of 2.5 meters or more.You only need to paste when installing, no wiring, it is very easy to use USE WITH YOUR SYSTEM:This product can be used with your system to respond to signals from the alarm keypad/console. Provides very loud voice prompts at 120 decibels. This piercing plug-in alarm plugs into your keyboard/console.