The Personal Home Security System Window and Door Alarm provides an easy-to-use, cost-effective security solution to protect you and your family from home intrusions, thanks to a 90-decibel alarm that is loud enough to make potential intruders think twice about entering through your door or window. | Easy to install and operate, with no wires required for installation, protecting any door or window in your home is as simple as attaching the alarm to the door or window with double-sided tape (included). | Multi-purpose magnetic contact door alarm / door bell ringer / pool door alarm / refrigerator door alarm / pry door alarm. Magnetically triggered - sounds when children and people with dementia open windows or interior doors. Each window alarm features an open/close/bell switch for easy operation. Perfect for homes, apartments, dorms and offices. | Prevent any accidents - keep kids out of cabinets, above ground pools, alcohol. Monitor wandering, sleepwalking, elderly getting out of bed by themselves to avoid all kinds of dangers. | Magnetic sensor switch detects your door or window. Easy to install and operate, press the on/off switch to turn power on/off, then insert 2 AAA batteries (batteries not included in the box), peel off the double-sided tape on the backpack, and attach the door handle alarm to your target location.