Source:http://linkedlifedata.com/resource/umls/id/C1135965
UMD: Devices designed to attenuate high-level noise, typically more than 80 to 90 decibels. These devices typically consist of a padded headband and multiposition, lightweight ear cups. Ear muffs may prevent ear damage, and they are easier to remove and replace than ear plugs for intermittent applications.