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A range of circular noise activated warning signs that light up to warn of high sound levels. These signs are a plain blue disk when the sound levels are OK but light up with a clear message when the levels go above the threshold you have set.
Both the NS-WARN (for noisy environments) and the NS-QZON (for quiet zones) can be easily mounted on a wall using a single screw, like a picture. The threshold level is adjusted using dials on the back, which can be covered by a plate to avoid tampering.