The present invention relates to a wireless security system for prevention. According to the present invention, an unmanned monitoring device constituting the wireless security system comprises: a sensor unit (100) for detecting an object and determining whether the object is an intruder; a light unit (200) for emitting light to the object when the object is determined as an intruder; a speaker unit (300) for outputting a warning broadcast to the object when the object is determined as an intruder; a camera unit (400) for capturing an image including the object; a communication unit (500) for transmitting the image to a user terminal in real-time and transmitting the image to a cloud server when the object is determined as an intruder; and a control unit (600) for controlling operations of the sensor unit (100), the light unit (200), the speaker unit (300), the camera unit (400), and the communication unit (500). Accordingly, the operation is possible without the installation of a power line and a communication line.
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