EASY INSTALLATION: 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 paste when installing. installation, no wiring, very easy to use SMALL & 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. STAND-ON ALARM alarm: An on-site alarm with a siren sounds up to 120dB, combined with door/window sensors, PIR motion detectors to form an effective, self-contained apartment security system. USE WITH YOUR SYSTEM: This product can be used with your system to respond to keypad/alarm console signals. Delivers very loud voice prompts at 120 decibels. This piercing plug-in alarm plugs into your keyboard/console. Features: Material: plastic and metal Rated voltage: 12V DC Sound rating: 120dB Sound frequency: 3.8KH2 + 10% Transmission speed: 3H2 increase or 10% decrease Size: 5.2 * 5.0cm / 2.0 * 2.0in Package Weight: 64g / 2.3oz Package List: 2 * Sound Alarm System Note: Other items are not included, the color is based on the first picture and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you! Note: The data is all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be some difference of color, the actual object received shall prevail.