Big Loud Alarm: Door and window sensors powerful enough to detect entry, prevent kids and babies from leaving the house, protecting your home office, garage, dorm room or apartment whether you are inside or outside. You can definitely hear it from another room to alert you. Don't worry about little kids playing with it, just place it high up where they can't reach it. Work on sliding doors, windows, drawers and refrigerator. Prevent kids and babies from leaving the house unnoticed. Protect your home from burglars in your windows and doors. EASY INSTALLATION: Wipe the flat surface, peel off the sticker, mount the alarm on the door and attach the magnetic strip to the door frame. Done! Easy installation with adhesive. Tap the window or door. Ideal entrance warning for homes, apartments, RVs, offices, hotel rooms, garages, etc. Note: The data is manual measurement, please allow 1-3cm error due to differences in light and display. There will be a certain color difference, the specific in