Peltor optime 2 neckband ear defenders protection of 31d b conforms to en352 3 recommended for noise levels of between 94d ba and 105d ba ideal for high and medium frequency noise suitable for use in environments with substantial industrial noise or construction machinery airports and agricultural work low profile with generous inside depth makes it easy to team with other equipment and means that the ear rests comfortably lightweight and rests comfortably around the neck and shoulde