Cancel out the background noise with Noise Sensor Technology. Noise cancelling technology. Ambient Sound Mode - stay connected to your natural surroundings. Adjust ambient sound and other settings with Sony Headphones Connect app. Digital Sound Enhancement Engine - reproduce music with authentic vocals and powerful bass. Built-in microphone with Wind Noise Reduction Structure. Adaptive Sound Control - senses activity to adjust ambient sound settings. 5mm Driver unit - powerful bass and clear vocal quality. Frequency response: 20Hz-20000Hz.