Big, LOUD alarm that alerts you the moment a door, window or drawer opens Audible from another room so you won't miss an entry alert Helps prevent young children or babies from leaving the house when you're nearby Ideal for protecting a home office, garage, dorm room or apartment Mount up to keep the unit out of reach of small children Works on sliding doors, windows, drawers and refrigerator doors Quick, tool installation Clean the flat surface, peel the adhesive backing and stick the alarm unit to the door and the magnetic stripe to the frame. That's it. Reliable trigger and easy reset Alarm activates when the alarm and magnetic stripe are separated by more than 0.39inch (10mm) Alarm continues until you either close the door (reconnect the magnetic contacts) or switch the unit to the button 'OFF' Compact size and basic control Dimensions: 2.52' x 1.67' x 0.66' — fits in small spaces and on most door or window frames Three adjustable settings (on/off) Practical use scenarios Child safety: mount near the main exit to hear if a toddler opens the door. Property security: protect a dorm room or home office by alerting you to unauthorized entry. Access control: place on a fridge or medicine cabinet to monitor access. What you should know Simple stickon installation with a loud, continuous alarm until the sensor is reconnected or switched off Small, unobtrusive design that can be positioned where it's most effective and out of reach of children