Howard Leight R02532 Impact Sport 22 dB Over the Head Gray/Black Youth/Adult SmallIt carries a Noise Reduction Rating (NRR) of 22 in both on and off mode. When the electronic ear protection is switched on, it employs built in directional microphones that amplify ambient sounds to a safe 82 dB. This allows you to hear important commands on the range and crucial environment sounds when hunting. For additional shooting hearing protection, it also actively listens and automatically shuts off amplification when loud impulsive sounds