Earphones that tune out voices but not birdsong; traffic but not emergency sirens. Earplugs that are also hearing aids... A ...

A microphone in the hearing aid picks up sounds from your environment. These sounds are then converted into electrical ...

I f you've been a PC user for a while, you might remember the days when a sound card was an essential part of building a ...

In all of these cases, my full-size air purifiers have made a significant impact on the air quality in my home. Heck, I've ...