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Prison Wall Listening Device 50hz-16khz Monitoring Frequency

Prison Wall Listening Device 50hz-16khz Monitoring Frequency

Prison Wall Listening Device 50hz-16khz Monitoring Frequency

50HZ~16KHZ Monitoring frequency,Multifunctional Stereo Listening System Model: HWCW-V Description Multifunctional stereo audio system can receive and record analog sound signals (human voice, ...

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prison wall listening device

      

50hz wall listening device

      
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