SNR-value 35 dB. For extreme exposure of noise. Features: New technology with double tray minimizes the resonance in the casing. Max. High frequency insulation, signals and voice can be easily noticed at the same time. Acoustic connection between the inner area and the area between the tray provides for an optimal absorption of the low frequencies. Wide, with soft foam filled sealing ring guarantees a good custom-fit and weak pressure. High insulation power and best comfort.