What device is specifically designed to monitor windows and doors?

The device specifically designed to monitor windows and doors is a contact sensor. This device typically consists of two components: one part is mounted on the door or window frame, and the other part is placed on the door or window itself. When the door or window is closed, the two components are aligned and the circuit remains closed. If the door or window is opened, the components move apart, breaking the circuit and triggering an alarm. This functionality makes contact sensors particularly effective for security systems aiming to protect entry points into a building.

In contrast, motion sensors are utilized to detect movement within an area but are not specific to doors and windows. Heat detectors respond to changes in temperature rather than physical entry points, while surveillance cameras capture video footage of an area but do not provide direct monitoring of whether doors or windows are opened or closed. Thus, contact sensors are the most suitable choice for monitoring openings such as windows and doors.