E-A-R H7A-PTL Ear Muffs

Valve system increases attenuation as noise levels increase to greater than 120 dB. Designed for those with a critical need to hear machinery sounds and verbal communication. Can be worn over the head or under the chin (NRR 17 dB), or behind the head (NRR 16 dB).
NRR is the Noise Reduction Rating in decibels (dB). It is the average noise reduction obtained by a group of people wearing a specific hearing protector in a laboratory test. Research suggests that many users will receive less noise reduction than indicated by the NRR due to variation in earplug fit and and wearing time. It is recommended that the NRR be reduced by 50% for estimating the average amount of noise reduction provided.