Loud Alarm: These window sensors are powerful enough to detect intrusions, prevent children and toddlers from leaving the home, and protect your home office, garage, dorm, or apartment, whether you're inside or outside. You can easily hear it from another room. Don't worry about small children playing with it; simply place it out of their reach. Works on sliding doors, windows, drawers, and refrigerators. Prevent children and toddlers from leaving unnoticed. Protect your home from intruders at windows and doors. Easy Installation: Wipe the surface clean, peel off the sticker, attach the alarm to the door, and the magnetic strip to the door frame. Done! Easily attaches with adhesive tape. Ideal entry alert for homes, apartments, RVs, offices, hotel rooms, garages, etc. Note: Dimensions are manual measurements; please allow for a 1-3cm error. Due to differences in lighting and display, there will be some color difference; the actual product received will prevail.