Intrusion alarms are security systems designed to detect unauthorized entry into a building or area. They typically consist of sensors placed on doors, windows, and other entry points, which trigger an alarm when breached. These alarms can alert the property owner, security personnel, or local authorities, helping to prevent theft or vandalism. Most intrusion alarms can be monitored remotely through smartphone apps, allowing users to receive real-time notifications. Some systems also include features like video surveillance and motion detectors, enhancing overall security. Regular maintenance and testing are essential to ensure these systems function effectively when needed.