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advantage of super sensitive intruder alarm

Super Sensitive Intruder Alarm Circuit Principle:

IR transmitter always emits the IR (Infrared) rays which have to be received by IR receiver. When there is an obstacle in front of IR sensor, the transmitted IR rays are reflected back to the IR receiver. The output of Op-Amp is high when IR receiver receives the reflected IR rays. This output of operational amplifier is connected to the RESET pin of 555 timer.
IR transmitter always emits the IR (Infrared) rays to which have been to be received by IR receiver. When it is in front of IR sensor, the transmitted IR rays are it reflected back to the IR receiver. The output of Operational-Amp is high it IR reflected IR rays. This output of operational amplifier is connected to the RESET pin of 555 timer.