State-of-the-art Sensear devices filter speech from harmful background noise to provide optimum safety and unparalleled hearing protection at noise levels beyond 85dB. Groundbreaking technology isolates speech so you can communicate near construction, manufacturing and aviation equipment without removing your hearing protection. Tiny microphones enhance speech in real time while reducing dangerous noise to safe levels. Background noise characteristics are retained for improved awareness of surroundings. Rechargeable battery provides a minimum 12 hrs. continuous talk time.