Notes

A door alarm (also called a door sensor) is an essential part of a home security system to keep your home safe. A door sensor keeps track of whether a door is open or closed. These alarms alert you either audibly and/or with a text notification when a door has been opened (depending on your settings). With a door alarm you can know that your home is secure, and that no one is coming or going without your knowledge. The same technology used for door sensors can also be used on windows. This technology is simple, reliable, and affordable, which makes them ideal for DIY home security systems. To begin deciding on how many door alarms you need, assess the layout of your home. Get to know how your windows open and how your doors lock and what they look like from outside the house. Case your own home like a potential burglar would, and you'll have a good idea of where and how many magnetic door alarms or window sensors you'll need. Cove’s door alarm sensors are simple, yet so reliable and affordable that they're a no-brainer for a home security system. Their small form factor makes them unobtrusive and practically unnoticeable in your house or apartment. They can also easily be relocated to a more convenient or effective position around your door or window, or to a different window or door entirely. Put them wherever they best fit your needs.

https://www.covesmart.com/products/door-sensor/