Polk Audio ULTRA FOCUS 6000 In-Ear Headphones, Black Audiophile Performance Digital Sound- Exceptional detail, full fidelity & deep bass impact for life like performance Active Noise Canceling-Battery-assisted true active noise canceling eliminates the distractions of the outside world (battery included) Ultra Fidelity Dynamic Balance Transducers- Polk's proprietary driver technology guarantees full frequency response while minimizing distortion Easily Accessible In-Line Controller-Easy to use control of the volume and push-to-hear technology Push-To-Hear Ambient Control-Mutes the audio and amplifies outside sounds so you can hear without removing the headphones