Sony MDR NC40 - headphones

Sony's MDR-NC40 noise canceling headphones reduce up to 90 percent of ambient noise and feature an ultra-lightweight, foldable design for easy storage. A microphone detects and automatically reduces sounds such as jet engines, busses or trains, or office noise to provide a quieter environment that enhances your listening experience. Up to 40 hours of battery life lets you enjoy clear music for extended periods of time. For added convenience, the monitor button lets you mute the audio so you can hear surrounding sound without taking off the headphones, and a supplied plug adapter provides easy connectivity to stereo or in-flight music services.