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How do Ear Defenders work?

We all know what ear defenders are, but how do they work?

How do ear defenders work?

Ear defenders are a common form of personal protective equipment (PPE) used to help protect the ears against harm in several ways. They can protect against physical damage and also the impact of excessive noise.

Ear defenders can appear a little like headphones but do not have the audio abilities. They are made up of two cups covering the outer part of the ear and are connected with a band that fits over the top or behind the head to keep the cups in place.