Big LOUD ALARM: Door window sensors loud enough to detect entry, prevent kids and babies from going out the house, protecting your home, office, garage, dorm room, or apartment whether you are in or out. You can definitely hear it from another room to alert you. Install it up high where young children can't reach to avoid messing with it. Works on sliding doors, windows, drawers, and fridges. Prevent kids and babies from going out without notice. Protect your house from unauthorized entry through windows and doors. EASY INSTALLATION: Wipe the flat surface, peel off the sticker, mount the alarm on the door and magnetic stripe on the door frame. Done! Easily mounted by adhesive. Ideal for homes, apartments, mobile homes, offices, hotel rooms, garages, and more. Color: As shown in the picture. Note: Data are manual measurement, please allow a 1-3cm error. Due to differences between light and display, there may be a certain color difference; the specific received item shall prevail.