Hardware: Is there a way to mute the volume of the Ear Defenders?

Noise cancelling or muting the internal speakers of the FocusLite would lead to being overprotected in lower noise environments.

This paragraph from HSE regulations, refers to Passive hearing protectors and Over protection:

“Protectors that reduce the level at the ear to below 70 dB should be avoided, since this over-protection may cause difficulties with communication and hearing warning signals. Users may become isolated from their environment, leading to safety risks, and generally may have a tendency to remove the hearing protection and therefore risk damage to their hearing.“. 

The following table shows the exact limits that have been applied to the FocusLite software.