3M Optime 101 sound-attenuating earmuffs with a noise reduction rating of 24 dB. - Brand: 3M - Model Name: Optime 101 -- Model Number: H7P3E Thank you for viewing. - Applications: Ideal for environments requiring noise protection, such as factory work, construction sites, mowing, shooting, and studying. Unopened item. The outer box is also in good condition, but please check the images.