The acoustic safe "Laretz 4" is designed to protect speech information circulating in a room from interception using cellular telephones by creating a standardized signal/noise ratio at the input of the receiving sensor (microphone) of the cellular telephone in a soundproof container.
The device provides a standardized acoustic noise/signal ratio in octave frequency bands at the inputs of cellular telephone receivers.
The device is designed to accommodate 4 cellular telephones.
The level of acoustic interference at a distance of 0.5 m from the device does not exceed the maximum spectrum corresponding to PS-40.
The frequency range of masking interference is 175 - 10000 Hz.
The device does not affect the operability of cellular telephones in normal modes.
The device ensures that acoustic noise interference is switched off when the container is opened.
The device provides two modes of light indication with the container open and closed.
The device is powered by an alternating current network with a frequency of 50 Hz and a voltage of (220±22) V.