The 3M Noise Indicator alerts users to potentially dangerous noise levels where hearing protection may need to be worn.
Users simply clip it to a shirt or jacket. A flashing LED light delivers a clear indication when noise levels exceed a potentially hazardous threshold.
Using this simple device to protect workers' hearing makes what is normally a difficult judgment call a clear and easy decision.

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
Especially useful in work environments where noise levels vary
Rechargeable battery operates for up to 200 hours between charges; charges via USB cable (sold separately)
Can also be used as a mapping tool to determine where noise protection is necessary
Operating temperatures: 14F - 122F
Sold by the each