AblePlanet NC180BMM Black Noise Canceling Headphones Frequency Response: 20Hz - 20,000Hz Sensitivity at 1 kHz: 115 dB (Off); 121 dB (On) Plug: 3.5mm, 1/4 Home Stereo Adaptor, AAA Battery (1), Soft carrying pouch Featuring Award-Winning Patented LINX AUDIO a Hear the Difference technology In-Line Volume Control for Easy Adjustment to Safe Listening Levels