Quoting Mic tets

Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, and radio and television broadcasting. The most common type of microphone transducer is the electret condenser. Electret condensers are built as high-end studio and film mics, cheap consumer mics, and are by far the most common mic in electronic devices cellphones, laptops, hearing aids, etc. Get more information [url=https://leetcode.com/Russel55/]mic test iphone[/url]