he 3M Noise Indicator (NI-100) alerts users to potentially dangerous noise levels, helps to indentify areas where hearing protection may need to be worn.  

Users simply clip the Noise Indicator to a shirt or jacket, its LED light delivers a clear indication when noise levels exceed a potentially hazardous threshold.

Red Flashing LED: Noise levels are above 85 dBA – hearing protection may be required. 

Green Flashing LED: Noise levels are below 85 dBA - hearing protection may not be necessary.