Sony Noise Canceling Headphones, MDR-NC11A/WHI
Sony's MDR-NC11A Noise Canceling Headphones Features: Reduce noise by 70% (10dB) with the noise canceling circuit switched on. 9mm driver units produce powerful sound for listening enjoyment. Noise canceling circuit actually senses outside noise with built-in microphones and sends an equal-but-opposite canceling signal to the headphones. Noise canceling on/off switch located on the battery box indicates when noise canceling is operating.
