Photo 1 of Zuomeng Noise Detector with Traffic Light Alert & Adjustable dB Threshold & Volume, Temp & Humidity Display, for Classroom Noise Control, Fun Interaction for Easy Noise Management

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Photo 1 of Zuomeng Noise Detector with Traffic Light Alert & Adjustable dB Threshold & Volume, Temp & Humidity Display, for Classroom Noise Control, Fun Interaction for Easy Noise ManagementPhoto 2 of Zuomeng Noise Detector with Traffic Light Alert & Adjustable dB Threshold & Volume, Temp & Humidity Display, for Classroom Noise Control, Fun Interaction for Easy Noise Management