They are especially useful when working in places where strong noise (motor transport, sea surf, Storm River, etc.) drowns the signal from
the device's dynamics. Masking external sounds, the headphones bring an audible signal from the object directly to the ear. Often deep objects can not generate a signal enough to sound the speaker, but in the headphones we can hear it already. This way the headphones increase the detection depth of the object.
the device's dynamics. Masking external sounds, the headphones bring an audible signal from the object directly to the ear. Often deep objects can not generate a signal enough to sound the speaker, but in the headphones we can hear it already. This way the headphones increase the detection depth of the object.
Soon the students will begin to pass through metal detectors at the entrance to the schools. the necessity of installation of metal detector frames at the entrance to each school. They note that this practice has long been used in educational institutions.Separately note that the protection of the building should be guided by professionals, namely employees of departmental protection, and not private security companies. As a rule, the posts in the school are recruited by the guards on the "residual trait".
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