The Hocks Noise Braker Filter converts sonic energy into thermal energy by means of compression acceleration. The rise in temperature is so minute one never notices. Thus one can still hear, while dangerous levels of sound are blocked by the filter.
- A practical way to guarantee against excessive noise exposure, which can be damaging.
- Ideal for loud work and social environments, such as Airports, NASCAR, Music Concerts, Etc...
- NRR-19