The Intruder Alarm Working Model Project is an innovative and practical science project designed to demonstrate the working principle of a real-time home security system. Built using an advanced IR sensor module and buzzer circuit, this model detects motion or unauthorized entry and instantly activates an alarm. It clearly explains the concepts of motion detection, electronic circuits, and security alarm systems, making it ideal for Physics investigatory projects.Perfect for Class 9, 10, 11, and 12 students, this working model is highly suitable for school science exhibitions, CBSE practical exams, and STEM-based learning activities. The neatly assembled components on a sturdy base allow students to confidently present and explain the project during viva and competitions.This intruder alarm project helps students understand the practical applications of sensors, alarm circuits, and modern security technology used in homes and offices. It encourages hands-on learning, improves technical knowledge, and enhances presentation skills. A great choice for students looking to create an impressive and high-scoring science exhibition project.