Hearing protectors

Cut-off level: 85 dB

Power supply: 2 AAA batteries (not included)

Noise Reduction Rating (NRR): 23 dB

Explanation

NRR (Noise Reduction Rating) is a noise reduction coefficient used in the United States and accepted in other countries. It represents the approximate level of noise reduction provided by hearing protection, expressed in decibels (dB). The NRR value indicates the average attenuation and standard deviation across seven frequency bands (from 125 Hz to 8000 Hz). Due to differences in calculation methods, this value differs from another commonly used rating system, SNR.

H: 32 dB M: 27 dB L: 18 dB

SNR noise reduction rating: 29 dB

Explanation

The values H, M, and L indicate how much the sound level at the eardrum is reduced when using hearing protection in the case of high-frequency noise (H), mid-frequency noise (M), and low-frequency noise (L). The SNR parameter is a single-number rating that describes the overall protective performance of hearing protection devices. Both SNR and H, M, L values are calculated based on sound attenuation measurements.