The paper presents an improved multi-mode alert notification IoT-based anti-burglar defense system called IMANoBAS. The system integrates three notification modes—SMS, call, and email—to ensure timely and reliable alerts in case of a burglary attempt. It uses a Passive Infrared (PIR) sensor for detection and a central hub or microcontroller for data processing. The system is designed to work with Arduino IDE, using C++ programming. The hardware components include a PIR sensor, buzzer, LED, and network interface. The software ensures seamless integration with the hardware, enabling accurate event detection and alert generation. The system's performance is evaluated based on responsiveness, achieving an average of 83.56% responsiveness across all notification modes. The study highlights the importance of integrating multiple notification modes to enhance security and reliability, especially in areas with unstable communication channels. The proposed system offers a robust solution for remote monitoring and alerting, making it a valuable tool for homeowners and security professionals.The paper presents an improved multi-mode alert notification IoT-based anti-burglar defense system called IMANoBAS. The system integrates three notification modes—SMS, call, and email—to ensure timely and reliable alerts in case of a burglary attempt. It uses a Passive Infrared (PIR) sensor for detection and a central hub or microcontroller for data processing. The system is designed to work with Arduino IDE, using C++ programming. The hardware components include a PIR sensor, buzzer, LED, and network interface. The software ensures seamless integration with the hardware, enabling accurate event detection and alert generation. The system's performance is evaluated based on responsiveness, achieving an average of 83.56% responsiveness across all notification modes. The study highlights the importance of integrating multiple notification modes to enhance security and reliability, especially in areas with unstable communication channels. The proposed system offers a robust solution for remote monitoring and alerting, making it a valuable tool for homeowners and security professionals.