These ear muff pads are built to last, are adjustable and offer protection against the elements. Have not much wear; not electronically operated. Ear pads are retrofitted with green stripes and black shell housing. Can fit medium small to medium large heads. Foam pads are shock resistant against noice decibels increasing or other harmful extremities. These hunting and gun shooting range muffs are designed for comfort and safety, with adjustable headband and sound features. The plastic material and blue color make them durable and stylish. The muffs have a passive noise reduction (NRR) of 1000hz to 4000hz, with a single number rating (SNR) of 1000hz to 4000hz. They are approved by OSHA and come with no manufacturer warranty. The muffs are a type of headphones with an adjustable hearing protection mode, and are suitable for unisex adults. The model year is 1987, and they have no connectivity or power source. Mailed with USPS Ground Advantage also international shipping as well..