3M™ Noise Indicator Badge
LED flashes red when noise levels become dangerous
Be alerted to dangerous noise levels and identify areas where hearing
protection is needed. A red LED flashes when noise levels reach at least 85 db; a green flashing LED means noise levels are safely below 85 db. Conveniently clips to your shirt or jacket. Includes a rechargeable battery that runs up to 200 hours between charges. Charges with a mini-USB cable (Item no. 195430, sold separately). USA made.