Where do you place the sensors of an alarm system?

A magnetic contact, also known as a window/door contact, warns you when a window or door is opened. The sensor consists of 2 parts, and once those parts stop being connected, the alarm goes off. Install the sensor on windows and doors that are susceptible to breaking or entering. Make sure sure that the sensor is placed relatively high on the door, so you can't accidentally kick it off, or to prevent your cat from playing with it.

If you own a dog or cat, you should choose a motion detector that's designed around pets. You can also opt to install the sensor upside down, at about a 1.2m height. If the sensor is installed upside down, it won't detect anything that happens beneath it. This means the sensor won't detect your pets, but it will detect uninvited guests.

Install a siren somewhere you can hear it throughout the house. Close to the stairs or living room, for example. If you own a siren with a light signal, install it rooms where you spend a lot of time, such as the living room or bedroom.