Notes

Window Security Sensor
While it may seem like a security device as simple as a magnet could easily be fooled, it's actually trickier than you think. The magnets inside the two halves of a window sensor are aligned specifically to the switch inside. Yet you may be wondering, could a potential intruder disable a contact switch from the outside with a powerful magnet? Well, the burglar would first have to accurately locate the device from the outside of the window, and with the sensor's small form factor, that's a pretty difficult thing to do. Even in a window, the Cove’s system’s contact sensors are difficult to find from the outside. And if they are found, a magnet would have to be powerful enough to fool a contact sensor through normal window frames. Furthermore, a stronger magnet has a greater chance of triggering the alarm than silencing it, as a large disruption to the regular magnetic field could potentially activate the alert switch.

Couldn't a burglar just break the window and fool the sensor from the inside? That is an excellent question, and one that is answered by Cove’s personal security package. By building a system for your home, apartment, or small business, with multiple pieces of monitoring hardware, you can fortify any potential weaknesses in your system. Installing a glass break sensor and a motion sensor will work as redundancies in your layered home protection system to alert you and your professional monitoring company to any potential threats to you and your property if an intruder does smash through your window.

Source: https://www.covesmart.com/products/window-sensor/