Safety never sounded so good as with the new safety works digital ear muffs. These MP3 FM/AM Radio ear muffs allow you to listen to your favorite music while safely blocking out the noise on the job. They have been tested by a third party lab and meet OSHA requirements for noise reduction they have also been checked to ensure that the radio MP3 player volume does not exceed a safe level. So go ahead and drill, mow, or saw with confidence your hearing is protected.