A hearing loop works with a hearing device that has a telecoil or t-coil. When a hearing loop is used with the assistive hearing device, the hearing loop is able to cut out confusing background noise. This would be impossible without a hearing loop because an assistive hearing device elevates ALL sound, not just the sound you want to hear.
Here is a video from Contacta, our assistive listening device dealer. The United States statistics may be different, but the loop information is the same.