Sony Premium Lightweight Noise-Canceling Stereo Headphones 30mm Neodymium Dynamic Dome Drivers - Specially designed, powerful drivers deliver deep and powerful bass that perfectly complements today's popular music genres Active Noise-Canceling Circuitry - Flip the switch and take advantage of proven Noise Canceling technology, based on the intelligent analysis of environmental ambient noise, and enjoy outstanding noise-free (up to 95%) audio performance Up to 80 Hours of Battery Life - One AAA alkaline battery provides up to 80 hours of continuous, noise-free music playback Pressure-Relieving Earcup Cushions - Seamless, noise Canceling ear pads use pressure relieving urethane foam for not only an outstanding fit, but also reduced ambient noise Swivel-Fold Earcups - Slim in stature with swivel-fold earpads, Sony Extra Bass headphones are lightweight when worn, yet easily stow away in a backpack or book bag when on the go