A detection and transmission system (200, 300, 400) characterized by comprising: a first detection and transmission device comprising: a first sound receiver configured to receive sound signals; a first output device configured to generate light, audio signals, video signals, audio and video signals, or network signals when being activated; a first object detector configured to detect object motion; and a first sound generator configured to generate sound signals; and a second detection and transmission device disposed along a first direction of the first detection and transmission device comprising: a second output device configured to generate light, audio signals, video signals, audio and video signals, or network signals when being activated; a second object detector configured to detect object motion; a second sound receiver configured to receive sound signals; and a second sound generator configured to generate sound signals; wherein: when the first object detector detects a first moving object, the first sound generator generates a first sound signal toward the first direction; when the second sound receiver receives the first sound signal, the second output device is activated; when the second object detector detects a second moving object, the second sound generator generates a third sound signal toward the first detection and transmission device; when the first sound receiver receives the third sound signal, the first output device is activated; when the first sound receiver receives the third sound signal and the first object detector detects the second moving object, the first sound generator generates a fourth sound signal along the first direction; when the second sound receiver receives the fourth sound signal, the second output device is inactivated; and the sound signals generated by the first sound generator and the second sound generator are ultrasound signals. a first detection and transmission device comprising: a first sound receiver configured to receive sound signals; a first output device configured to generate light, audio signals, video signals, audio and video signals, or network signals when being activated; a first object detector configured to detect object motion; and a first sound generator configured to generate sound signals; and a first sound receiver configured to receive sound signals; a first output device configured to generate light, audio signals, video signals, audio and video signals, or network signals when being activated; a first object detector configured to detect object motion; and a first sound generator configured to generate sound signals; and a second detection and transmission device disposed along a first direction of the first detection and transmission device comprising: a second output device configured to generate light, audio signals, video signals, audio and video signals, or network signals when being activated; a second object detector configured to detect object motion; a second sound receiver configured to receive sound signals; and a second sound generator configured to generate sound signals; a second output device configured to generate light, audio signals, video signals, audio and video signals, or network signals when being activated; a second object detector configured to detect object motion; a second sound receiver configured to receive sound signals; and a second sound generator configured to generate sound signals; wherein: when the first object detector detects a first moving object, the first sound generator generates a first sound signal toward the first direction; when the second sound receiver receives the first sound signal, the second output device is activated; when the second object detector detects a second moving object, the second sound generator generates a third sound signal toward the first detection and transmission device; when the first sound receiver receives the third sound signal, the first output device is activated; when the first sound receiver receives the third sound signal and the first object detector detects the second moving object, the first sound generator generates a fourth sound signal along the first direction; when the second sound receiver receives the fourth sound signal, the second output device is inactivated; and the sound signals generated by the first sound generator and the second sound generator are ultrasound signals. when the first object detector detects a first moving object, the first sound generator generates a first sound signal toward the first direction; when the second sound receiver receives the first sound signal, the second output device is activated; when the second object detector detects a second moving object, the second sound generator generates a third sound signal toward the first detection and transmission device; when the first sound receiver receives the third sound signal, the first output device is activated; when the first sound receiver receives the third sound signal and the first object detector detects the second moving object, the first sound generator generates a fourth sound signal along the first direction; when the second sound receiver receives the fourth sound signal, the second output device is inactivated; and the sound signals generated by the first sound generator and the second sound generator are ultrasound signals.