Based on my testing, the call quality was clear, and I did not encounter feedback, even in noisy areas. (tomsguide.com)
Ideally, a classroom with a hearing - impaired student should be located away from such noisy areas of the school as the cafeteria or playground. (educationworld.com)
In fact, if your baby is in a very noisy area, he or she may «tune out» the sound and fall into a deep sleep. (womenandinfants.org)