There are three microphones for enhanced audio experience while attending phone calls or recording videos. (techone3.in)
We found that the HD radio enhances the audio quality a little bit, but it doesn't increase range or get rid of static. (cnet.com)
For example, the two layers we were introduced to — one is an extra battery layer, and other is a speaker layer which enhances the audio output from the smartphone. (phoneradar.com)