Unlike the usual ear plugs , the attenuation of this model is progressive. All noises are heard clearly and accurately but attenuated to a comfortable and harmless level. Excellent hearing precision in open position and two levels of attenuation (medium or high) thanks to the shut-off valve.
Low for noise from 4 to 80 dB of noise.
Average for noise from 24 to 100 dB of noise.
High for noises from 39 to 120 dB of noise.
This model is CE certified for PPE. Attenuation values tested according to EN 352-2: 2002 of directive 89/686 / ECC.